10 Worst Computer Viruses in history

Computers viruses, worms, ransomware, etc. are kinds of malicious software that no user should take lightly. On several occasions, we have touched upon security steps that each user should take in order to protect its identity and data. Sadly sometimes even when all precautions are taken some malware can still slip through and wreak havoc. Today we are looking at some of the worst or the best, depending on your view that has indeed wreaked plenty of havoc.

10 worst computer viruses in history

In the list of the 10 most famous computer viruses below, we show the costs, dates, reach, and other key facts. First a note about terms: we use the words “virus” and “worm” interchangeably because most readers search for them that way. But there’s a subtle difference that we explain after the list.

1. Mydoom – $38 billion

The worst computer virus outbreak in history, Mydoom caused estimated damage of $38 billion in 2004, but its inflation-adjusted cost is actually $52.2 billion. Also known as Novarg, this malware is technically a “worm,” spread by mass emailing. At one point, the Mydoom virus was responsible for 25% of all emails sent.
Mydoom scraped addresses from infected machines, then sent copies of itself to those addresses. It also roped those infected machines into a web of computers called a botnet that performed distributed denial of service (DDoS) attacks. These attacks were intended to shut down a target website or server.

Mydoom is still around today, generating 1% of all phishing emails. That’s no small feat considering the 3.4 billion phishing emails sent each day. By that figure, Mydoom has taken on a life of its own, infecting enough poorly-protected machines to send 1.2 billion copies of itself per year, 16 years after its creation.
Though a $250,000 reward was offered, the developer of this dangerous computer worm was never caught.
Wondering what makes the world’s most secure computers so safe? See the Tech@Work guide: Upgrade to the World's Most Secure and Manageable PC

2. Sobig – $30 billion

The 2003 Sobig computer virus is actually another worm. It is second only to the Mydoom virus in its scope. The $30 billion figure is a worldwide total, including Canada, the U.K., the U.S., mainland Europe, and Asia. Several versions of the worm were released in quick succession, named Sobig.A through Sobig.F, with Sobig.F being the most damaging.
This cybercriminal program masqueraded as legitimate computer software attached to emails. It disrupted ticketing at Air Canada and interfered with countless other businesses. Despite its widespread damage, the creator of the successful bug was never caught.

3. Klez – $19.8 billion

Klez is a close third on the list of the worst computer viruses ever created. With nearly $20 billion in estimated damages, it infected about 7.2% of all computers in 2001, or 7 million PCs. The Klez worm sent fake emails, spoofed recognized senders and, among other things, attempted to deactivate other viruses.
As with other viruses and worms, Klez was released in several variants. It infected files, copied itself, and spread throughout each victim’s network. It hung around for years, with each version more destructive than the last.
Windows has come a long way since most of the computer viruses on this list hit the web. Thankfully, built-in protection with Microsoft Defender is always on the watch.

4. ILOVEYOU – $15 billion

The year 2000’s ILOVEYOU virus worked by sending a bogus “love letter” that looked like a harmless text file. Like Mydoom, this attacker sent copies of itself to every email address in the infected machine’s contact list. Shortly after its May 4 release, it had spread to more than 10 million PCs.
The virus was created by a college student in the Philippines named Onel de Guzman. Lacking funds, he wrote the virus to steal passwords so he could log into online services he wanted to use for free. He reportedly had no idea how far his creation would spread. This virus is also known as Loveletter.
Need to up your remote work security game before there’s another entry on the list of most deadly computer viruses? See our guide: How to Work Remotely and Securely

5. WannaCry – $4 billion

The 2017 WannaCry computer virus is ransomware, a virus that takes over your computer (or cloud files) and holds them hostage. The WannaCry ransomware ripped through computers in 150 countries, causing massive productivity losses as businesses, hospitals, and government organizations that didn’t pay were forced to rebuild systems from scratch.
The malware raged like wildfire through 200,000 computers worldwide. It stopped when a 22-year-old security researcher in the U.K. found a way to turn it off. Computers with out-of-date operating systems were hit especially hard. That’s why security experts always recommend updating your systems frequently.

Ransomware strikes again

In September 2020, one of the potentially largest computer virus attacks in medical history hit Universal Health Services. The U.S. hospital chain, which has more than 400 locations, was reportedly struck by damaging ransomware. The attack forced the cancellation of surgeries and made healthcare workers switch to paper records.

6. Zeus – $3 billion

The Zeus computer virus is an online theft tool that hit the web in 2007. A whitepaper by Unisys three years later estimated that it was behind 44% of all banking malware attacks. By then, it had breached 88% of all Fortune 500 companies, 2,500 organizations total, and 76,000 computers in 196 countries.
The Zeus botnet was a group of programs that worked together to take over machines for a remote “bot master.” It originated in Eastern Europe and was used to transfer money to secret bank accounts. More than 100 members of the crime ring behind the virus, mostly in the U.S., were arrested in 2010. It’s not as prominent today, but some of the virus’ source code lives on in newer botnet viruses and worms.

Zeus caused documented damage of $100 million. But the real cost in terms of lost productivity, removal, and undocumented theft is undoubtedly much higher. A $3 billion estimate, adjusted for inflation, puts this virus at a cost of $3.7 billion in today’s dollars.

7. Code Red – $2.4 billion

First observed in 2001, the Code Red computer virus was yet another worm that penetrated 975,000 hosts. It displayed the words “Hacked by Chinese!” across infected web pages, and it ran entirely in each machine’s memory. In most cases it left no trace in hard drives or other storage.
Financial costs are pegged at $2.4 billion. The virus attacked websites of infected computers and delivered a distributed denial of service (DDoS) attack on the U.S. White House’s website, www.whitehouse.gov. In fact, the White House had to change its IP address to defend against Cod Red.
Can your printer get a virus? See our cool infographic: The State of Printer Security

8. Slammer – $1.2 billion

The SQL Slammer worm cost an estimated $750 million across 200,000 computer users in 2003. This computer virus randomly selected IP addresses, exploiting vulnerabilities and sending itself on to other machines. It used these victim machines to launch a DDoS attack on several internet hosts, significantly slowing internet traffic.
The Slammer worm hit banks in the U.S. and Canada especially hard, taking ATMs offline in many locations. Customers of Toronto’s Imperial Bank of Commerce found themselves unable to access funds. The attack reared its ugly head again in 2016, launching from IP addresses in Ukraine, China, and Mexico.

9. CryptoLocker – $665 million

Thankfully, ransomware attacks like the 2013 CryptoLocker virus have dipped since their 2017 peak. This malware attacked upwards of 250,000 machines by encrypting their files. It displayed a red ransom note informing users that “your important files encryption produced on this computer.” A payment window accompanied the note.
The virus’ creators used a worm called the Gameover Zeus botnet to make and send copies of the CryptoLocker virus. According to a report by security firm Sophos, the average ransomware attack costs a business $133,000. If we estimate that CryptoLocker hit 5,000 companies, that would put its total cost at $665 million.
Where will cybersecurity go next? See our guide: The Future of Cybersecurity

10. Sasser – $500 million

The Sasser worm was written by a 17-year-old German computer science student named Sven Jaschan. He was arrested at the age of 18 in 2004 after a $250,000 bounty was posted for the computer virus’ creator. A friend of Jaschan’s tipped authorities that the youth had penned not only the Sasser worm but also the damaging Netsky.AC attack.
Jaschan was given a suspended sentence after it was found he was a minor when he wrote the malware. The Sasser worm crashed millions of PCs, and though some reports put damages at $18 billion, the relatively low infection rate suggests a more likely cost of $500 million.
Other notable viruses

The top 10 worst computer viruses above are just the ugly tip of a gargantuan digital iceberg. With a million new malware programs popping up every 3 years, we may miss the forest for a few outstanding trees. Here are just a few more viruses that have wreaked havoc over the years:

Mimail: This worm tried to harvest data from infected machines to launch a string of DDoS attacks, but was relatively easy to remove.

Yaha: Yet another worm with several variants, thought to be the result of a cyber-war between Pakistan and India.

Swen: Written in C++, the Swen computer worm disguised itself to look like a 2003 OS update. Its financial cost has been pegged at $10.4 billion, but not reliably.

Storm Worm: This worm showed up in 2007 and attacked millions of computers with an email about approaching bad weather.

Tanatos/Bugbear: A 2002 keylogger virus that targeted financial institutions and spread to 150 countries.

Sircam: A computer worm from 2001 that used counterfeit emails with the subject line, “I send you this file in order to have your advice.”

Explorezip: This worm used fake emails to spread to every machine on thousands of local networks.

Melissa: The most dangerous computer virus in 1999, Melissa sent copies of itself that looked like NSFW pics. The U.S. FBI estimated cleanup and repair costs at $80 million.

Flashback: A Mac-only virus, Flashback infected over 600,000 Macs in 2012 and even infected Apple’s home base in Cupertino, Calif. In 2020, there’s now more malware on Macs than on PCs.

Conficker: This 2009 virus still infects many legacy systems and could do significant damage if it ever activates.

Stuxnet: This worm is reported to have destroyed Iranian nuclear centrifuges by sending damaging instructions.

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Fix NMI_HARDWARE_FAILURE in Windows

If you encounter the NMI_HARDWARE_FAILURE Blue Screen error while using your Windows 10 computer, then read on as this post will guide you in resolving this kind of Blue Screen of Death error. NMI HARDWARE FAILURE or “Non-Maskable Interrupt” Blue Screen error occurs when there is some hardware malfunction in your computer. When you encounter this Blue Screen error, you may get a stop code of 0x00000080 which can randomly occur while you use your computer. However, a lot of users reported encountering this error while they were trying to update or install their Graphics Card drivers. The stop code that you may get for this BSOD error is 0x00000080. The error can occur randomly during your usage of the computer – but a large number of users have reported this error while they are updating or installing their Graphics Card drivers. In this post, we will be covering all the possible fixes for this error. NMI_HARDWARE_FAILURE error on Windows The NMI_HARDWARE_FAILURE bug check has a value of 0x00000080. This bug check indicates that a hardware malfunction has occurred. There are various hardware malfunctions that can cause this kind of Blue Screen error. However, pinpointing the exact cause is quite difficult. Worry no more for the following fixes provided below can help you resolve the NMI_HARDWARE_FAILURE Blue Screen error no matter what the cause of the problem is.

Option 1 – Try removing hardware or drivers that you’ve installed recently

If you have recently installed some hardware or drivers, you might want to disable or remove them since external devices are proven to be one of the factors that trigger Blue Screen errors like NMI_HARDWARE_FAILURE. All you have to do is physically disconnect any external devices that are connected to your computer and then check if it fixes the BSOD error or not.

Option 2 – Try to rollback, update, or disable the Graphics card drivers

Since the NMI_HARDWARE_FAILURE Blue Screen error has something to do with Graphics card drivers, you can either roll back, update or disable them depending on your preference in order to resolve the error.

First, boot your computer into Safe Mode.
After that, tap the Win + R keys to launch Run.
Type in devmgmt.msc into the box and tap Enter or click OK to open the Device Manager.
After that, a list of device drivers will be displayed. From there, look for the Display Adapters and click on them.
After that, right-click on each entry under the Display Adapters and select the “Uninstall Device” option from the menu.
Now restart your computer.
After restarting your computer, go to the Settings app and Check for Updates in the Windows Update section.

Note: You also have the option to go directly to the website of your graphics card manufacturers like NVIDIA, Intel, or AMD and go to the section called Drivers then check if there’s a new available update – if there is, download and install it.

Option 3 – Make sure that all memory modules have the same type

This third option is quite technical and tricky. If you often use multiple physical RAMS on your Windows 10 computer, then you have to check first if they are of the same frequency. After that, the first thing you should verify is if the chip is properly compatible or not. And if the sockets are attached using some kind of adapter or non-recommended device, it could cause some issues while giving a performance hit to your computer. If you were able to find such a setup, you have to undo it or install the proper and recommended as well as compatible hardware.

Option 4 – Try to run the Blue Screen Troubleshooter

As you know, the Blue Screen troubleshooter is a built-in tool in Windows 10 that helps users in fixing BSOD errors like the NMI_HARDWARE_FAILURE error. It can be found on the Settings Troubleshooters page. To use it, refer to these steps:

Tap the Win + I keys to open the Settings panel.
Then go to Update & Security > Troubleshoot.
From there, look for the option called “Blue Screen” on your right-hand side and then click the “Run the troubleshooter” button to run the Blue Screen Troubleshooter and then follow the next on-screen options. Note that you might have to boot your PC into Safe Mode.

HTTP Error 500 – Edge Installation or Update

If you are trying to install or update Microsoft Edge on your Windows 10 computer but ended up getting HTTP Error 500 or Error 0x8004xxxx or 0x8007xxxx, then you’ve come to the right place as this post will help you sort this problem out. The aforementioned errors when either installing or updating the Edge browser occur due to a Network issue. There is actually a range of error codes that are associated with the network connection issue. These error codes include Error 500 or 0x80010108, 0x80040801, 0x80042193, 0x80042194, 0x800421F4, 0x800421F6, 0x800421F7, 0x800421F8, 0x80072742, 0x80072EE2, 0x80072EE7, 0x80072EFD, and 0x80072EFE. To fix them, there are several options you can try. You can try to run the Network Adapter troubleshooter or update or reset the Network Adapter as well as check and the proxy configuration.

Option 1- Try updating the Network Adapter Driver

Follow the steps below to update your Network Adapter Driver:

Tap the Win + R keys to launch the Run window and then type in the “MSC” command and hit Enter to open the Device Manager window.
From there, expand the list of all the network drives and update each one of them.

Note: If updating the network drivers didn’t help in fixing the problem, you can also try to uninstall the very same drivers and restart your Windows 10 PC. After that, the system itself will reinstall the drivers you just uninstalled. Alternatively, you can also download and install the drivers from the manufacturer’s website directly.

Option 2 – Run the Network Adapter troubleshooter

To run the Network Troubleshooter, refer to these steps:

Open the Search bar on your computer and type in “troubleshoot” to open the Troubleshoot settings.
Next, scroll down and select the “Network Adapter” option from the right pane.
Then click on the Run Troubleshooter” button.
After that, your computer will check for any possible errors and will pinpoint the root cause of the problem if possible.
Restart your computer.

Option 3 – Try to reset the Network Adapter

You can also try to perform a Network Reset to resolve the problem. This will reset the entire network configuration including your IP address. To perform Network Reset, follow these steps:

Tap the Win + I keys to open Settings.
From there, go to the Network and Internet section.
Next, scroll down and look for “Network Reset” under the status pane.
After that, click on Network Reset and then on Reset now to start resetting the network configuration. Once done, check if it is able to fix the error or not.

Option 4 – Try to fix the Proxy Settings

In the Cortana search box, search for Internet Explorer and then click on the related search result.
After that, tap the Win + T keys on your keyboard and click on Internet Options.
Next, navigate to the Connections tab and click on LAN Settings.
Then click on the Advanced button and delete all the entries in the list generated in the Exceptions section. And if the Advanced button is disabled because the “Use a proxy server for your LAN (These settings will not apply to dial-up or VPN connections)” option is disabled then you are good to go. Now proceed to the next step.
Tap the Win + X keys or right-click on the Start button and select Command Prompt (Admin) or you could also search for “cmd” in the Cortana search box and right-click on Command Prompt from the search results and select the “Run as administrator” option.
If a User Account Control appears, click on Yes to proceed. After that, type each one of the commands listed below, and don’t forget to hit Enter after you type each one of them.
- netsh winhttp reset proxy
- net stop wuauserv
- net start wuauserv

Now restart your computer and check if the problem is fixed or not by installing or updating Microsoft Edge again.

Fix Orange Screen of Death Error in Windows

The Windows 10 Orange Screen of Death, unlike Blue Screen of Errors, is quite an uncommon error where the hardware is the culprit which is mostly caused by some issues with the GPU. If you are currently facing this problem, then you’ve come to the right place as this post will guide you on what you can do to fix it. There have been reports from users that the Orange Screen of Death is caused by various reasons. Some users reported that they encountered Orange Screen of Death when they were watching a YouTube video, while some were not able to boot into their Windows 10 PCs and encountered an error instead of that either says, FAULTY_HARDWARE_CORRUPTED_PAGE or WHEA_UNCORRECTABLE_ERROR error. In addition, this error can also occur when your computer wakes up from Sleep or while using BitLocker, or while you use a second monitor. Whatever the case is, you can try updating your drivers or lower the clock speed of the GPU. You could also try to fix the DRIVER_IRQL issue in case it’s the one that triggers the error or performs Automatic Repair or uninstalls any recently installed software.

Option 1 – Update your Graphics card drivers

One of the possible reasons why you’re getting the Orange Screen of Death error is most likely related to the Graphics card drivers in your computer. Thus, the first thing you can do to resolve it is to update these drivers by following these steps:

First, boot your computer into Safe Mode.
After that, tap the Win + R keys to launch Run.
Type in msc into the box and tap Enter or click OK to open the Device Manager.
After that, a list of device drivers will be displayed. From there, look for the Display Adapters and click on them.
After that, right-click on each entry under the Display Adapters and select the “Uninstall Device” option from the menu.
Now restart your computer.
After restarting your computer, go to the Settings app and Check for Updates in the Windows Update section.

Option 2 – Try to uninstall software you’ve installed recently

If you have installed a software or two recently and then suddenly encounter this Orange Screen of Death, then they are most likely the culprits. The best thing you can do is to first check the System Log in the Event Viewer for any additional information in case it’s not the GPU but some other driver or device that’s causing the error. Once you have identified the culprits, uninstall them and see if the error is fixed.

Option 3 – Try disabling Overclocking

If overclocking is enabled, you might have to disable it as some users reported that the WHEA_UNCORRECTABLE_ERROR 0x00000124 error started to appear right after overclocking. To disable it, follow the steps below.

Go to the Start Menu and open Settings.
Next, select Update and Security and go to the Recover tab.
From there, click on Restart now in Advanced startup. This will restart your computer.
Once you’re in the Advanced startup, go to Troubleshoot and then select Advanced Options.
From there, select the UEFU Firmware Settings.
Now click on Restart. Once your computer has restarted, it will automatically open BIOS.
From the BIOS, go to the Advanced tab and navigate to Performance and then look for Overclocking.
Once you’ve found Overclocking, make sure that it is disabled. If it’s not, then disable it and then save the changes made by tapping the F10 key.
Start your computer normally and check if the WHEA_UNCORRECTABLE_ERROR 0x00000124 error is now fixed.

Option 4 – Use the Driver Verifier Manager

The Driver Verifier Manager is another tool in Windows that could help you fix driver-related issues. And so if you want to fix the Wdf01000.sys Blue Screen error, you need to use the Driver Verifier Manager:

Type in the keyword “Verifier” in the Cortana search box to search for Verifier in Windows 10.
After that, select the option “Create custom settings”.
Make sure that you have checked everything except the options “DDI compliance checking” and “Randomized low resources simulation”.
Next, select the option “Select driver names from a list” option.
Afterward, you have to select all the drivers from any unofficial or third-party provider. To simply put it, you have to select all the drivers that are not supplied by Microsoft.
Then click on the Finish button.
Open Command Prompt as administrator and execute this command – verifier /querysettings
The command you just executed will display the Driver Verifier settings so if you see any of the flags enabled boot your Windows 10 PC into Safe Mode.
Open the Command Prompt as admin again and run this command – verifier /reset
The command will reset the Driver Verifier. Once the process is done, restart your PC and check.

Option 5 – Try to run the Automatic Repair Utility

You might also want to use Automatic Repair in fixing the error. To do so, follow the steps below.

You can start by creating and booting from a bootable Windows 10 USB Stick.
After that, click on Repair your computer located on the bottom left corner when you are on the initial Windows Startup screen.
Next, click on Troubleshoot, and then on the other screen, click the Startup Repair option.
Now select the operating system you want to repair. Once you do that, it will start to repair your operating system. Wait until the process is completed and then check if the problem’s now fixed.

Making your own Minecraft server in Windows

Minecraft has taken the world like a storm and if you tried it, you could tell why, procedurally created worlds, various modifications available and fun gameplay are just some of the things this game offers and it is non wonder why kids and adults are enjoying it. Minecraft is even more fun when you play with your friends on dedicated servers, where you all can adventure and build together. Sadly as everything costs, so does the Minecraft servers as well. Lucky you can create your own Minecraft server on your computer so your friends can join and play with you free of charge with just a little time you need to spend reading this guide and building one for yourselves. Without further delay let's dive right into it.

1. Install the most recent Java version

In order to run your personal server, you will need to own and have Minecraft: JAVA edition, not Windows 10 one. If you have this version of the game and it is already running it means that you already have JAVA as well but we will need to check to see if it is the latest version of JAVA, to check this do the following:

Press Windows and type in configure java followed by ENTER
Under the update tab, click on the update now button
If you have the latest version you are all good, if not follow the onscreen instruction on how to update it.

If by any chance you do not have JAVA installed you can get it here.

2. Prepare a dedicated location for your Minecraft server files

You can use any folder you like for your Minecraft server folder but it is highly recommended to create a new folder whose sole purpose will be to hold and run Minecraft server files. this will be very beneficial in the future when server files need to be updated or configured. Having things in one isolated space is always a good idea and keeping things organized is also a good idea.

3. Download, install and start the Minecraft: Java Edition server file

It is now time to download server files, you can get them here. Download the server.jar file and place it inside your server folder. Once everything is downloaded and prepared do the following:

Run the server.jar file, the first time it runs, the file will create some configuration files.
After additional files appear, there should be a text document called eula.txt. Open it with a text editor then change eula=false to eula=true.

4. Enable port forwarding on your router

This sep is required if you want to have people to play with you that are outside your router network, for example, if you want them to connect to your server from their home. If you do not wish to do this and want only people on your serves from your router network you can skip this step. Unfortunately, to enable port forwarding, you’ll need to make your computer on your local network to be accessible by other computers over the internet via a router. This will effectively make your port to be an open port. This can make your system vulnerable to malicious attacks. Once you’ve enabled it, set the default server port to 25565. You’ll need the Server IP address, which you can get by opening Command Prompt or PowerShell and run ipconfig. Your IP address is usually listed as IPv4 or IPv6 Address.

5. Run the Minecraft server

Simply double-click the server.jar file to run the server. If you want to have more control over it, use the command line.

Navigate to your Minecraft server directory using file explorer.
We will be using PowerShell instead of Command Prompt to enter commands. Hit Shift + Right-click on the directory window and select “Open PowerShell window here.”
Once you are in the right directory, write the following command:

java -Xms1024M -Xmx1024M -jar {server file name} nogui

Replace the {server file name} with the full name of .jar file. The command above will make the server run with no Graphical User Interface (GUI) and use 1024MB of allocated RAM space.
If you want to enable the GUI, remove the nogui command. Additionally, you can edit the memory allocation for the server by changing the Xms and Xmx value.
After the server is up, invite your friends to play by sharing your local or public IP address, depending on whether you are using a local or public network. For a local network, you can give the IPv4 or IPv6 Address earlier. For public networks, go to Google and type “what is my ip” to get the address.

Attempt was made to reference a token

If you were trying to open File Explorer but it suddenly stopped working and you encounter an error message that states, “An attempt was made to reference a token that does not exist”, read on as this post will guide you in fixing this problem. This problem was initially reported after the April Update and Microsoft was able to fix it right after correcting the build. However, this effort seems futile for some users as recently, some reported getting the same error when they try to open not just Windows File Explorer but also with utilities like Microsoft Management Console or MMC, Visual Studio, Task Manager, Printer, Recycle Bin, etc. Two of the most likely causes of this error are a troublesome Windows Update and corrupted system files. Whatever the cause is, here are some suggestions you can follow to fix the “An attempt was made to reference a token that does not exist” error.

Option 1 – Try to re-register the problematic DLL file

You may have to re-register the ntdll.dll file using the regsvr32.exe before you can successfully install the program and fix the ntdll.dll file crash error. The Regsvr32 tool is a command-line utility that can be used to register and unregister OLE controls like DLL and ActiveX (OCX) control in the Windows operating system. Follow the steps below to use it.

Open Command Prompt as admin from the WinX menu.
Next, type the following commands in the elevated Command Prompt and hit Enter to execute the command. This will re-register the affected DLL file using the Windows operating system tool, regsvr32.exe.
- exe /[DLL file]
- exe [DLL file]

Note: Replace “[DLL file]” with the name of the DLL file that was pointed out in the error.

After you execute the given commands, you should see a message saying, “DllRegisterServer in vbscript.dll succeeded” if the Regsvr32 tool was able to run successfully. After that, try to install the program again and see if it now works.

Option 2 – Replace the DLL file from a trusted source

First, you need to get the new DLL file from another computer with preferably the same file version number.
After that, you need to boot your PC into Safe Mode and navigate to the paths listed below and then replace the file using a USB drive or other external storage devices.
- x86: This PC > C:/Windows/System32
- x64: This PC > C:/Windows/SysWOW64
Next, type “cmd” in the Cortana search box and right-click on Command Prompt, and select “Run as administrator” to open it with administrator privileges.
Now type the “regsvr32 ntdll.dll” command and hit Enter.
Restart your PC and check if the error is now fixed.

Option 3 – Perform a System File Checker scan

The System File Checker or SFC scan could detect and automatically repair damaged system files that could be causing the “An attempt was made to reference a token that does not exist” error to pop up. SFC is a built-in command utility that helps in restoring corrupted files as well as missing files. It replaces bad and corrupted system files with good system files. To run the SFC command, follow the steps given below.

Tap Win + R to launch Run.
Type in cmd in the field and tap Enter.
After opening Command Prompt, type in sfc /scannow and hit Enter.

The command will start a system scan which will take a few whiles before it finishes. Once it’s done, you could get the following results:

Windows Resource Protection did not find any integrity violations.
Windows Resource Protection found corrupt files and successfully repaired them.
Windows Resource Protection found corrupt files but was unable to fix some of them.

Option 4 – Try reverting back to the previous build of Windows

This kind of error might have something to do with a Feature Update so you can try to revert your computer to a previous build of Windows 10 as it could help you fix the problem. In this case, it would better if you refrain from updating your Windows 10 computer until this problem is completely resolved by Microsoft.

Windows 10 isn’t activated after upgrading for free

Error Code “Windows 10 isn’t activated after upgrading for free” – What is it?

Windows 10 isn’t activated error occurs when Windows users attempt to upgrade to Windows 10 for free and end up in a non-activated state. It is a Windows 10 activation error affecting PC owners who attempt to upgrade their Windows 7 or Windows 8.1 operating systems. A message box will appear with the following message: “Windows 10 isn’t activated after upgrading for free from Windows 7 SPI or Windows 8.1 update.”

Common symptoms of this error code include the following:

Inability to upgrade for free to Windows 10
The appearance of activation error code in the message box

Solution

Error Causes

To understand the cause of this activation error, users will need to understand activation within Windows. Activation is a process that allows Windows to verify that you are upgrading your operating system based on the Microsoft Software Licensing Terms. These terms specify, for instance, the number of devices upon which you can use Windows.

Once you have a genuine copy of Windows and you are following the terms mentioned earlier, you should be able to activate and complete the upgrade to Windows 10. However, the activation fails when these conditions are not met. Note also that the error may occur if users fail to upgrade to Windows 10 before reinstalling, requiring them to repeat the installation process by first going back to the previous version of Windows present on their system. Once the upgrade process is not done as should, you might encounter other Windows 10 errors such as error code 0xc0000142

If you see this error code, “Windows 10 isn’t activated after upgrading for free” proceed to rectify it using manual repair methods below.

Further Information and Manual Repair

To fix this activation error code in Windows 10, users will need to employ at least one manual repair procedure. This process can successfully be completed by non-technical Windows users. However, you may also consider getting assistance from a Windows repair technician if you are not certain you have the requisite skills needed to complete the manual repair tasks below.

The main methods to resolve the error code “Windows 10 isn’t activated after upgrading for free from Windows 7 SPI or Windows 8.1 update” is as follows:

Method One: Manually Activate Windows

If you attempted upgrading for free to Windows 10 and ended up with the activation error you will need to first perform a manual activation. Follow the steps below to complete the process.

Step one: Tap or click the Start button
Step two: Select Settings then Update & security
Step three: Select Activation
Step four: Once activation status is Connect to the Internet to activate Windows, click or tap Activate

The steps above enable users to successfully activate Windows 10 if the issue involves a connection problem. However, if Windows is not activated, it may mean your copy of Windows is not genuine. This may require you purchase a copy of Windows to rectify the issue. However, if you have a genuine copy of Windows proceed by applying the steps found in method two.

Method Two: Use Product Key to Verify Copy of Windows

A valid product key is one way you can verify your copy of Windows is genuine. This will enable you to complete activation and allow you to access the free upgrade to Windows 10. Follow the steps below.

Step one: Click or tap the Start button
Step two: Select Settings then Update & security
Step three: Click Activation
Step four: Select Change Product Key then type in the product key. (Ensure you type the 25 characters in the correct order.)

Method Three: Use an Automated Tool

Error codes in Windows often occur due to poor maintenance of one’s PC. To improve your system and reduce your machine’s risk of experiencing error codes, download a powerful automated tool. This tool is both powerful and user-friendly, making its benefits accessible to even the most non-technical Windows users.

How To Repair Error Code C0000135

Error Code C0000135- What is it?

C0000135 is a blue screen of death error code (BSoD) also referred to as the ‘Stop’ error. This error code usually pops up on the screen at startup. The system stops and displays the error code:

Stop: c0000135 {Unable to Locate DLL} The dynamic link library FILE_NAME could not be found in the specified path Default Load Path

Solution

Error Causes

There are multiple reasons behind the error code C0000135 BSoD such as:

Missing and damaged .DLL files which is linked to registry corruption
Malware attack
Viral infection

When this error code pops, the computer screen turns blue and hampers your ability to use Windows successfully. Nonetheless, if the error C0000135 is not repaired timely this error can cause a great deal of damage to your PC. It puts you at risk of:

Data Loss with possibly no chances of recovery
System Failure and crash
Cybercrime if malware is the underlying cause of the occurrence of the error code C0000135

To avoid serious PC damages and inconvenience it is advisable to repair this error immediately.

Further Information and Manual Repair

There are two ways to fix the error code C0000135:

Hire a Professional
Download Error Tools PC Repair

Hire a Technician

Hiring a professional can be costly. You may have to pay hundreds of dollars to the technician to resolve this issue. However, the latter option is not only money-saving but also time-saving, convenient, and simple. In fact, it is so easy that even if you have no technical knowledge you can still work your way around it and repair the error in seconds.

Download Restoro

Restoro is a top-quality, efficient, and multi-functional PC fixer. It is integrated with cutting-edge technology. It has a comprehensive suite of advanced utilities like an intuitive registry cleaner, powerful anti-virus, and a smart system stability detector. All of these exciting and highly functional features are combined together in one. With this helper, you don’t need to search for the underlying cause of the error. When you experience the BSoD error code C0000135 on your system all you have to do is run it for a scan and its intuitive in-built technology will detect the issues and causes in no time and display them to you in the form of a comprehensive scan report. Once the scan is complete, you just have to hit the repair tab to resolve it. It’s that easy and fast! Restoro is powered by a highly functional registry cleaner. This cleaner helps detect all the errors related to the registry. It cleans the unnecessary files cluttering and damaging the hard disk including the junk files, invalid registry entries, internet history, and the files from the programs that you have uninstalled on your PC. These files acquire a lot of disk space and damage .dll files as well. Overloaded registry also slows down the system and the CPU and RAM then require more power to start and function. The registry cleaner embedded in the Restoro removes and wipes out all this unnecessary clutter, clears up the disk space and repairs the damaged files, and corrupted registry, and thus resolves the error code C0000135 on your system. Restoro also serves as a system optimizer. And when you repair issues on your PC with this helper, you’ll see a massive difference in the speed and performance of your computer. It will run smoothly and boot efficiently. Restoro is safe to use. It is bug-free and used widely by PC users experiencing different types of PC-related issues including the error code C0000135. It has easy navigation and a user-friendly interface. You can download and run Restoro on all Windows versions. Click here to download Restoro today!

WebShield Malware Removal Tutorial

Web Shield is a free application that allows you to view insightful analyses about the websites that you visit and specifically how they’re tracking you online. Web Shield cannot determine exactly who is tracking your computer usage. Instead, Web Shield allows a user to see which websites have placed tracking code onto their computer.

This software is ad-supported and displays advertisements in the form of injected banner ads, popups, and context hyperlinks in the user’s web browser. It adds Windows Background services, displays unwanted advertisements, and can modify the browser’s home page.

About Browser Hijackers

Browser hijackers (also called hijackware) are a type of malicious software that modifies web browser settings without the user’s knowledge or permission. These hijacks appear to be increasing at a worrying rate across the world, and it could be really nefarious and sometimes dangerous too. There are lots of reasons why you may experience a browser hijack; but commercial, marketing, and advertising are the main reasons for their creation. The idea is to force users to visit specific sites that are looking to increase their site visitor traffic and generate higher ad income. Nevertheless, it is not that harmless. Your web safety is jeopardized and it is also very irritating. Furthermore, hijackers will make the entire infected system fragile – other destructive malware and viruses would seize these opportunities to intrude into your system very easily.

Browser hijacking signs

Here are some symptoms that indicate you have been hijacked: home-page is modified; you see new unwanted favorites or bookmarks added, typically directed to ad-filled or pornography sites; the default search engine has been changed and the web browser security settings have been cut down without your knowledge; you notice many toolbars on the internet browser; you see lots of pop-up ads on your computer screen; your internet browser has become unstable or starts running slowly; you can’t visit certain websites like home pages of anti-malware software.

How does a PC get infected with a browser hijacker?

Browser hijackers might use drive-by downloads or file-sharing networks or even an email attachment to reach a targeted computer system. They may also originate from any BHO, browser extension, add-on, toolbar, or plug-in with the malicious objectives. Some browser hijackers spread in user’s PC by using a deceptive software distribution strategy called “bundling” (usually through shareware and freeware). A good example of a popular browser hijacker is the most recent Chinese malware named “Fireball”, which has attacked 250 million computers across the world. It acts as a hijacker but could be changed into a fully functioning malware downloader later on. Browser hijackers will affect the user’s web surfing experience severely, record the websites frequented by users and steal personal information, cause problems in connecting to the net, and eventually create stability issues, causing applications and systems to crash.

Browser hijacker removal

Some browser hijacking could be quite easily reversed by finding and removing the corresponding malware software from your control panel. But, most browser hijackers are difficult to get rid of manually. No matter how much you try to remove it, it can come back over and over. Moreover, manual removal requires you to carry out several time-consuming and intricate actions that are hard to do for novice computer users.

Malware Blocking Access To Safebytes Website And Anti-Malware Downloads - What To Do?

Every malware is bad and the effects of the damage can vary based on the specific type of malicious software. Some malware types alter browser settings by including a proxy server or change the computer’s DNS settings. In these cases, you’ll be unable to visit some or all internet sites, and therefore unable to download or install the required security software to get rid of the malware. If you’re reading this, chances are you’re stuck with a malware infection that is preventing you to download and/or install Safebytes Anti-Malware software on your PC. Even though this type of problem can be tougher to circumvent, there are some steps you can take.

Start your system in Safe Mode

If the malware is set to load at Windows start-up, then booting in Safe Mode should avoid it. Since just the bare minimum programs and services start-up in Safe Mode, there are rarely any reasons for issues to occur. The following are the steps you need to follow to start your computer into the Safe Mode of your Windows XP, Vista, or 7 computers (go to Microsoft website for directions on Windows 8 and 10 computers). 1) Tap the F8 key continuously as soon as your computer boots, but before the large Windows logo or black screen with white texts appears. This would conjure up the “Advanced Boot Options” menu. 2) Make use of the arrow keys to choose Safe Mode with Networking and press ENTER. 3) Once this mode loads, you should have internet access. Now, get the malware removal program you need by using the browser. To install the program, follow the guidelines within the setup wizard. 4) Right after installation, run a complete scan and allow the program to delete the threats it detects.

Switch over to an alternate browser

Some malware only targets particular browsers. If this is your situation, make use of another internet browser as it might circumvent the malware. If you appear to have a trojan attached to Internet Explorer, then switch to a different web browser with built-in safety features, such as Firefox or Chrome, to download your favorite antivirus program – Safebytes.

Install and run anti-virus from your Thumb drive

Here’s yet another solution which is utilizing a portable USB antivirus software that can scan your system for malware without the need for installation. Follow these steps to use a thumb drive to clean your infected computer system. 1) Make use of another virus-free PC to download Safebytes Anti-Malware. 2) Plug in the USB flash drive to a USB port on the uninfected computer. 3) Run the setup program by double-clicking the executable file of the downloaded software, which has a .exe file extension. 4) When asked, choose the location of the pen drive as the place where you want to put the software files. Follow the directions to complete the installation process. 5) Now, transfer the pen drive to the infected PC. 6) Double-click the anti-malware software EXE file on the USB flash drive. 7) Click on “Scan Now” to run a scan on the affected computer for malware.

Review of SafeBytes Anti-Malware

Do you want to download the very best anti-malware software program for your desktop? You can find many applications available that come in free and paid versions for Windows systems. A few of them are great, some are ok types, and some will harm your computer themselves! You need to pick one that is reliable, practical, and has a good reputation for its malware protection. When considering the reliable software programs, Safebytes Anti-Malware is undoubtedly the highly recommended one. SafeBytes anti-malware is a trusted software that not only secures your PC completely but is also quite user-friendly for people of all ability levels. Through its cutting-edge technology, this software protects your computer against infections caused by different types of malware and other threats, including spyware, adware, trojans horses, worms, computer viruses, keyloggers, ransomware, and potentially unwanted program (PUPs). SafeBytes anti-malware comes with a plethora of enhanced features that sets it apart from all others. Here are a few popular features present in this program: World-class AntiMalware Protection: This deep-cleaning anti-malware software program goes much deeper than most antivirus tools to clean out your personal computer. Its critically acclaimed virus engine locates and disables hard to remove malware that hides deep within your PC. Real-time Active Protection: SafeBytes offers complete and real-time security for your computer system. It’ll regularly monitor your laptop or computer for hacker activity and also provides users with advanced firewall protection. Web protection: SafeBytes checks and provides a unique safety rating to every website you visit and block access to web pages considered to be phishing sites, thus protecting you from identity theft, or known to contain malware. Low CPU Usage: SafeBytes is a lightweight and simple-to-use anti-virus and anti-malware solution. Since it uses very little computer resources, this software leaves the computer power exactly where it belongs to: with you actually. 24/7 Guidance: You could get high levels of support 24/7 if you’re using their paid version.

Technical Details and Manual Removal (Advanced Users)

If you’d like to manually get rid of WebShield without the use of an automated tool, it may be actually possible to do so by deleting the program from the Microsoft Windows Add/Remove Programs menu, or in cases of web browser extensions, going to the browsers AddOn/Extension manager and removing it. You’ll probably also want to totally reset your browser to its default settings. If you choose to manually delete the system files and registry entries, make use of the following list to make sure you know precisely what files to remove before undertaking any actions. Please keep in mind that this is for advanced users only and might be challenging, with incorrect file removal leading to additional system errors. In addition to that, certain malware is capable of replicating or preventing deletion. It is recommended that you do the removal procedure in Safe Mode.

Files: %ProgramData%webshield %ALLUSERSPROFILE%Application DataWebShield %ALLUSERSPROFILE%WebShield Registry: [HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionUninstallmweshield] [HKEY_LOCAL_MACHINESOFTWAREmweshield] [HKEY_LOCAL_MACHINESYSTEMCurrentControlSetservicesmwescontroller]

Get public IP address inside Windows 10

There are a lot of online services and a lot of ways to get your public IP address. One of them being typing whats my IP in Google search and you will get immediate results. But there is a way to get the same information inside Windows 10 which could be very useful if for any reason you can not connect to mentioned services. By checking public IP directly inside your windows you can make sure that the issue for not being able to open some websites is not due to your public IP. In order to use this Windows feature, we will be checking our public IP using Windows PowerShell. To open Power Shell in Windows first press ⊞ WINDOWS + R to open the run dialog keyboard with windows and r marked

Inside run dialog type Powershell and press ENTER In the Powershell type in the following command and press ENTER

(Invoke-WebRequest -uri "http://ifconfig.me/ip").Content

When the command finishes you will see what is your public IP address, if you wish to know more about your connection type in and press ENTER:

Invoke-RestMethod -Uri ('https://ipinfo.io/')

This command will provide you with further information like city, region, country, and others.

Shutdown your PC properly

So, you have finished with work, game, movie, music, email, or whatever on your PC, you look at the clock, it is late, you decide to go to sleep or outside, you click on the power button and choose shutdown. Now when a PC is shut down you feel good and go with your business but the next time you power it up you get the same error like the computer never really shut down in the first place. You wonder why and reboot it, just in case and all of the sudden error is gone.

If something similar has happened to you or you had the feeling that after shutting down your computer has not really felt like shutting it down, do not seek professional help, everything is OK with you because when you click on shut down, your computer does not really shut down!

Truth is that Microsoft has changed how to shut down works and how rebooting works in Windows with an update but has not publicly said anything about it so some users may experience this feeling of not shutdown phenomenon and might even think there is something wrong with their PC.

Why this change?

A few years ago shutdown button and option in Windows were really shutting down OS, but things changed when Microsoft wanted to increase boot-up speed. Now when that decision was made shutdown option was changed. So, what was changed? Well in order to increase Windows booting time, the shutdown will now turn off power to PC components and it will look like everything is indeed shutdown but the Windows kernel will actually be saved to a hard drive with all settings and just awaken once the PC is turned back ON. This will result in all errors and other stuff being just still present same as they were once the system was instructed to be turned off.

Rebooting your PC will now clear kernel and file from the hard drive and you will get a clean system startup without any issues tied with the kernel itself.

Workaround

Now that we know why and what change has been made to Windows logical question is can we shut down our PC at all properly? Luckily for us, the answer is yes and we will not need any external application to do it, we can still do it inside Windows itself and it is quite quick and easy.

Bringing back the old shutdown

In order to bring the old shutdown functionality of your PC please follow the instructions but be aware that by doing this your PC will boot a little bit slower since it will have to load the kernel from scratch each time computer is turned ON.

First thing is to go to settings and go to System

Then once you are inside the system, navigate to the power and sleep and click on it to select it. Once you have it selected to all the way to the right and click on additional power settings.

When you click on advanced power settings you should be led to the control panel's power options. Inside this panel click on top left link where it says Choose what the power button does.

Inside options, you will need to untick the box next to Turn on fast startup (recommended), this option has been ticked ON by the Windows update and probably without notifying you. Option means exactly what was described, it will save kernel state on the hard drive for faster boot time but sadly it can cause some issues since it will never be reloaded from 0.

If you are unable to uncheck the box click on the text beside the shield icon that says: Change settings that are currently unavailable (you will have to be logged in as administrator).

Conclusion

Altho turning off fast startup and shutting down the PC completely will for sure extend your bootup time I still believe that it is the right choice since sometimes a lot of clutter and bad things accumulate over time inside the OS and can cause a vast variety of problems in a long run. So stay safe and shut down that PC as it used to be in the past.

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