Windows Upgrade/Activation error 0xc03f6506

Windows Sandbox item is greyed out

As you know, the functioning of the Windows Sandbox feature is supported by various components in the background of the Windows operating system. And the only way for you to enable the Windows Sandbox feature in your computer is through the Turn Windows features on or off utility. This feature will work directly on the basis of Virtualization which is also supported by Hyper-V. However, there are some reports claiming that some computers have the Windows 10 Sandbox item greyed out in the Turn Windows features on or off utility. Thus, in this post, you will be guided on what you can do to resolve such a problem in your Windows 10 computer. In this kind of problem, you should know that this has something to do with the Second Level Address Translation which is one of the important pillars of how the Windows 10 Sandbox feature functions. Thus, if the Second Level Address Translation or SLAT feature in Windows Sandbox is not supported by the CPU of your computer, there is no way for you to use Windows Sandbox on your computer. On the other hand, if SLAT is supported, then there is definitely something you can do to resolve the greyed-out Sandbox item in Windows 10.

To get started, follow the steps provided below.

Step 1: First, you have to boot into the BIOS of your PC. Step 2: After that, make sure that the following options are set to their respective configurations:

Hyper-V – Enabled
VM Monitor Mode – Yes
Virtualization – Enabled
Second Level Address Translation (VT-d or RVI) – Enabled
Data Execution Prevention – Enabled

Step 3: Once you’re done, save the configuration and then restart your Windows 10 computer as usual. Step 4: Once your computer has restarted, you should see the same option in the Turn Windows features on or off utility and it should no longer be greyed out. Then you can now enable the feature and follow the onscreen instructions need to use the feature as best as you can.

Protect Your PC With These 6 Reliable Security Products

What software are you using to keep your information and all your files and memories safe?

None? Yikes. Let’s hope no damage has been done to your data yet then. Because with how the digital world has evolved, your data might be getting leaked and you have no idea.

Why do you need to invest in security software?

There’s really no good excuse not to purchase a quality platform for PC protection. Especially since top security solutions are available at such affordable prices nowadays, your wallet would barely even notice it.

At this point, only people who barely use their PCs and have zero sensitive information on them can get away with simply using the built-in Windows 10/11 security software. But we guarantee that those people are extremely hard to find and that you’re not one of them, and here’s why.

Even if you don’t use your computer for things that are very obviously sensitive, such as internet banking, you still have some personal data at risk of being stolen. How so? Well, think about the data you enter into your social media profiles, for example. How devastating would it be if somebody got a hold of any of it? Yep, that’s what we thought.

A chain with a padlock on a laptop — Credit: FLY:D on Unsplash

In the hands of a skilled cybercriminal, your phone number alone could put you at risk of scams, ransomware, identity theft and more. Also think about the stuff you share in texts and social media chats. Think about the websites you visit and how many times you may have accidentally clicked on an ad, which could very well contain malicious software. Those all seem harmless until someone’s actually used them against you.

Now imagine the dangers involved when you actually store truly confidential data on your PC and browsers. Sends shivers down your spine, doesn’t it?

In the case of a successful cyberattack of whatever type (virus, phishing, worms, etc.), there’s so much that is at stake. Businesses/legal persons will suffer from financial loss and damaged reputation, at the very least. Natural persons may be threatened or exploited, get their banking or medical information and even their identity stolen, etc. And that’s just the tip of the iceberg.

These are our biggest reasons for investing in Windows PC protection software:

Cyberthreats are constantly evolving to the point where built-in or free software won’t cut it anymore.

Those working remotely can have peace of mind knowing both personal and business data is completely secure.

Businesses using top security solutions ensure their customers trust them.

Data breaches are a pain in the you-know-what to handle. Fighting a cyberattack and going back to normal is a demanding process, and not to mention the stress it’ll cause. We’d rather prevent all that by using trustworthy security products!

It helps parents worry a little less about their children’s safety in the online world.

Added bonus: with most products, you get an ad-free browsing experience!

Obviously, there are a lot more reasons to get your PC secured. But we think you get it. So let’s cut to the chase and take a look at our 6 favorite protection solutions and the wonders they can do for you.

*Note that in this article we’re looking at products primarily suited for households and home offices, some for small businesses. No enterprise solutions will make the list today, but stay tuned for a future article on those.

The bottom line

If you’ve made it all the way here, congratulations, you’ve made the right choice: to invest in securing your valuable data! Now the question is: which one of these 6 awesome antivirus/antimalware products to select?

The paradox of choice is a very real thing - we feel you. As mentioned, it comes down to what your specific needs are. So before you go ahead and purchase your security software, make sure to explore all options.

And if you really can’t handle the decision-making anxiety, feel free to reach out. We’ll happily assist you in finding the right product to keep your digital life secure!

Can’t connect to this network Windows issue

Can’t connect to this network Internet connectivity issues present a complex problem with simple solutions for PC and laptop users. First, it is usually recommended that users rule out problems with the internet connection, router, and Wi-Fi settings before proceeding to troubleshoot settings on your PC/laptop. Once the rest are ruled out, we can then proceed with the following troubleshooting steps and guidelines to fix your wifi connection issue: The first step is to update your windows network adapter driver. Connectivity problems may arise if your network driver is not updated or if it is incompatible with the network adapter. To do so, you may resort to any third-party driver scanning and installing programs found online. This solution should have resorted if users don’t want the hassle of perusing through windows settings that users may not be familiar with. However, this solution requires a pre-existing internet connection other than wifi, so it is recommended you have a backup internet connection via ethernet.

The second step is to uninstall the driver for your network adapter. This solution is to be reported if there is an issue with the driver as restarting the PC after the following steps let windows reinstall the driver again:

Open the quick access menu on your keyboard by pressing the Windows key and X key at the same time and select “Device Manager” from the menu list.
From the list of devices, select “Network Adapters”
Usually on the top of the list is the Wireless Network Adapter
Right-click the Wireless Network Adapter and select the option to “Uninstall device”
You will be given a confirmation in a new separate window to proceed. Click “Uninstall” to proceed.
After completing the previous steps, try rebooting your Windows PC and reconnecting to see if it works.

A third step is to disable the 802.1 1n modes of your network adapter by following the next steps:

First press the Windows logo key and the X key at the same time to bring up the quick-access menu. And like the previous step, select “Device Manager”
From the list of devices, select “Network Adapters”
Right-click the Wireless Network Adapter from the drop-down menu and select properties
Under properties, select the “Advanced” tab then select the 802.1 1n Mode. To the right drop-down menu change the option to “Disabled” and click “Ok”
After, try to re-establish the connection to see if the steps have worked.

In the event that any of the preceding did not fix your problem, it helps to take a second look at the router and network settings using the interface provided by your ISP. A simple reset to the back of your router often fixes the issue. Also, try to check if you have any other administrative capabilities over the network to determine whether your device, in particular, has been MAC filtered or if the frequency of your wireless adapter is not compatible with the broadcast frequency of your router.

What to do if Windows 10 Taskbar Volume Control is not working

The quickest way to control and manage the volume of your Windows 10 PC is using the Volume control icon in the system tray. However, you might encounter issues in using it especially if you recently updated your PC. After the update, if it no longer responds to mouse clicks, be it a right-click or left-click, read on as this post will show you what you can do to remedy that issue. If you think that you’re the only one who has experienced this problem, you are mistaken as several users also reported that the volume icon does highlight and shows the volume level if you hover the cursor over it but it does not really do anything at all. This is definitely the quickest way to change the audio output in Windows 10 especially when you have to change from speakers to your earphone and whatnot. If you are one of the users whose Windows 10 Taskbar Volume Control icon has stopped working and every time you click on the icon and nothing happens and you’re still not able to adjust the volume of your Windows 10 computer, read on as this post will show you what you can do to fix that problem. Although the audio is working just fine, you will still not be able to adjust the volume from its control icon. The problem is most likely related to the UI interaction. There are times when icons in the taskbar also experience the same issue where you can hover your mouse over them but nothing happens when you click on them. As mentioned, the issue with the volume icon does not seem to affect the actual audio of the computer. Double-check to confirm and if it turns out that the audio is indeed working fine, you can use the hardware of your keyboard to manage and control the volume, however, the software just won’t work. This issue is really inconvenient especially for users who connect their laptops to a bigger display. To fix this issue, here are some suggestions you need to check out.

Option 1 – Try to restart the Windows Explorer

This option may sound silly but it has actually worked in fixing the issue for some users. So if anything gets stuck on the taskbar or system tray, the best way to revive them is by restarting Windows Explorer.

Right-click on the taskbar and then select the Task Manager.
Next, look for Windows Explorer under the Processes tab.
Then right-click and select restart.
After that, wait for the restart process to be completed and for the user interface to refresh. Note that you will notice the Taskbar disappearing and reappearing again. It will reload the entire user interface and allows you to access the volume icon. It should work this time.

Option 2 – Restart the Audio services

Restarting the audio services in your computer can also help you fix the volume control issue and to do that, refer to these steps:

Tap the Win + R keys to open the Run dialog box.
Type in “services.msc” in the field and hit Enter to open Services.
From there, look for Windows Audio and then right-click on it and go to Properties.
After that, you have to make sure that the Startup Type is set to Automatic.
Then click on the Stop button. Once it has stopped, start it again.
Now restart your computer and see if you can now access the volume icon on the taskbar.

Option 3 – Try to update or roll back the Audio driver

If the glitch in your audio has something to do with software, chances are it might be related to the audio driver – it could be that the newest version of your Windows 10 does not work well with the old version of the driver. This is why you have to update your audio driver to the newest available version.

Tap the Win + R keys to open the Run dialog box and then type in devmgmt.msc and tap Enter or click OK to open the Device Manager.
Expand the section for the outdated device drivers.
And then select the outdated driver(s) and right-click on it/them.
From the drop-down menu, select the Update Driver option and follow the on-screen instructions to install the latest version of the driver.
Then also click on the option, “Search automatically for updated driver software.
Restart your PC after the installation.

Note: If updating the Audio driver didn’t work, you can go to the website of your PC manufacturer and look for the support section where you can download the drivers for your computer. You just need to take note of your PC’s correct model and model number so you can find the appropriate driver.

Option 4 – Try running the Playing Audio Troubleshooter

Since the Windows 10 operating system has the Playing Audio Troubleshooter, you can use this troubleshooter to try and fix the volume control issue on your PC. You can access this tool in the Control Panel or in the Taskbar Search and even on the Troubleshooters page of Windows 10. Run this troubleshooter and see if it can fix the issue or not.

Fix error code 0x80190001 in Windows

If you are trying to install a Feature Update in Windows 10 but you got the error code 0x80190001, then it means that there is something wrong with the installation files. The installation files are either corrupted or some of them failed to be downloaded. On the other hand, the issue might also have something to do with a driver issue. When you encounter error 0x80190001, you will see the either of following error message on your screen:

“Something went wrong Couldn’t download Windows 10, please check your network settings and try again. You can contact Microsoft support for help with this error. Here’s the error code 0x80190001”. Or: “An unexpected error was encountered while attempting to download files required for the upgrade”.

Here are some fixes that could help you resolve the error 0x80190001. Follow them carefully.

Option 1 – Run the Network Troubleshooter

As mentioned in the error message the issue might have something to do with the network settings of your computer so you can try to run the Network Troubleshooter and then try updating or installing Windows 10 again.

Option 2 – Update Network drivers

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, look for Network Adapters from the list of device drivers displayed. Once you find it, expand it to see the Network drivers.
Right-click on it and select the option “Uninstall device” – do the same thing for the other Network drivers.
Restart your PC so Windows can detect and reinstall the drivers you just uninstalled.

Option 3 – Use Storage Sense to clean up temporary and junk files

Open Setting > System > Storage from the WinX Menu.
From there, you will see a list of all the local and connected storage devices along with the details on the free space.
Now make sure that the Storage Sense feature is turned On then go find a link that says “Free Up Space” and click it to open.
After that, a screen which is the built-in program in Windows 10 will appear and will scan your computer for the following junk files so you can free up disk space:
Windows Upgrade Log Files
The system created Windows Error Reporting Files
Thumbnails
Temporary Internet Files
Previous Windows Installation Files
Delivery Optimisation Files
DirectX Shader Cache

Note: Once you’re done freeing up space on your drive, try to run the setup file again.

Option 4 – Delete the contents in the SoftwareDistribution folder

The Software Distribution folder in the Windows operating system is a folder that can be found in the Windows directory and is used to store files temporarily which might be required to install the Windows Update on your PC. Thus, it is required by the Windows Update and maintained by WUAgent. A lot of users tried deleting the files in this folder to fix the problem and so far it has worked. Like them, you can try clearing the Windows Update cache by simply deleting the contents of the folder named “SoftwareDistribution” since Windows apparently can’t clear and re-download the update contents once they are corrupted. Thus, deleting the contents of this folder will make Windows download the contents again which will fix the problem. To do that, follow the steps below.

Open the WinX Menu.
From there, open Command Prompt as admin.
Then type in the following command – don’t forget to hit Enter right after typing each one of them.

net stop wuauserv net stop bits

After entering these commands, it will stop the Windows Update Service and the Background Intelligent Transfer Service.
Next, go to the C:/Windows/SoftwareDistribution folder and get rid of all the folders and files thereby tapping the Ctrl + A keys to select them all and then click on Delete. Note that if the files are in use, you won’t be able to delete them.
Once all the contents in the Software Distribution folder are deleted, restart your PC and then go back to Command Prompt and input the following commands again.

net start wuauserv net start bits

Since the folder has already been flushed, it will be populated afresh the instant your restart your computer and open Windows Update.

Option 5 – Run the Windows Update Troubleshooter

You might also want to run the Windows Update Troubleshooter as it is also known to help users resolve Windows Update errors like error 0x80190001.

Option 6 – Try to disable your antivirus program

Disabling the antivirus program or any security software installed in your computer is always a good idea you can try when the Windows Update process does not go smoothly. So before you try updating your computer again, make sure to disable the antivirus or security program and once the Windows Update is done, don’t forget to enable the antivirus program back again.

Option 7 – Try to use the Media Creation tool

The Media Creation tool in Windows allows you to use the ISO installation file to make a bootable device that you can use to install Windows on your PC. Note that this is kind of different from the usual installation process as it could erase your computer’s current settings and data on the primary drive. Thus, before you proceed, you need to backup all your data into some removable drive and then use the Media Creation Tool to make a bootable drive.

After making the bootable drive, you need to plug it into your computer and then reboot.
Next, tap the F10 or Esc key to open the boot options.
Now set the boot priority of the removable drive the highest. Once the setup comes forth, follow the next onscreen instructions and install Windows without any problems.

Fix Device requires further installation Error

If you are trying to connect an external device to your computer but you suddenly encounter an error that says, “Device requires further installation”, then you’ve come to the right place as this post will guide you on how exactly you can fix this error. In most cases, USB sticks, headphones, speakers, and other external devices, install drivers automatically once you connect them to your computer which means that the drivers are downloaded and installed in the system as soon as the external device is plugged in. However, if the driver has become corrupted or outdated, you might encounter an error like the

“Device requires further installation”

Aside from corrupted or outdated drivers, the error could also be caused by pending updates, an incorrect version of the Intel PROSet Wireless driver, or checking the wrong event. Whatever the cause is, this post will provide you with some potential fixes that can help you resolve the problem. But before you troubleshoot the problem, ensure that your Windows 10 computer is updated to its latest version and you must also not forget to check that you’re checking the correct event on the Event Viewer. Once you have these things covered, proceed to the instructions below.

Option 1 – Try to update the device drivers to the latest version

One of the most likely root causes of the “Device requires further installation” error is either outdated or corrupted drivers in your computer. This kind of problem is more common on several devices like scanners and printers for which the drivers are provided with them.

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 any outdated device drivers and click on each one of them.
After that, right-click on each entry of the device drivers 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 opt to download the latest versions of the device drivers directly from the website of the manufacturer. Once you’ve downloaded them, you can install them into your computer right away and then try connecting the external device again. On the other hand, you can also try to reinstall the device drivers.

Option 2 – Try to install the latest version of the Intel PROSet Wireless driver

A lot of users who experience the problem reported that their wireless driver wasn’t also working properly and it was then found that it was caused by the outdated Intel PROSet wireless driver. Thus, to fix the problem, you need to install the latest version of this driver from the intel.com website and install it on your computer. When you download the driver, make sure that your computer is running an Intel system and then download the correct driver depending on whether your computer is a 64-bit system or a 32-bit one.

Where can you get computer viruses & malware

From their infant stages to modern days, computer viruses were always kind of here. From simple ones that were annoying with playing speaker sounds and throwing messages on screen to more malicious ones capable of deleting and encrypting files. In today's modern world it is very important to protect yourself, modern viruses are not a joke anymore and they are aimed to create serious damage to computer systems. Where can you get computer viruses & malware

They can encrypt files in order to make you pay for a decrypter, they can straight up delete files or even cause some hardware damage. Like mentioned before protecting yourself is important, but protecting does not mean only having antivirus software installed, information, where are common places in which they lurk and could be picked up, is also very important. That is why we are exploring in this article the most common place where you can pick viruses or other malware.

Downloading Programs

Programs that contain the downloadable files are the commonest source of malware such as freeware, worms, and other executable files. Whether you download an image editing software, a music file, or an e-book, it is important to ensure the reliability of the source of the media. Unknown, new, or less popular sources should be avoided.

Pirated or Cracked Software

Are you aware of software cracking? Well, every time you open cracked software, your antivirus software might flag it as malware as the cracks consist of malicious scripts. Always say “No” to cracks as they can inject malicious script into your PC.

Email Attachments

Anyone can send you an email attachment whether you know them or not. Clicking on unknown links or attachments can harm your device. Think twice before clicking anything and make sure that file type is not ‘.exe’.

Internet

One of the easiest ways to get a virus on your device is through the Internet. Make sure to check the URL before accessing any website. For a secured URL always look for ‘HTTPS in it. For example, when you click videos published on social media websites, they may require you to install a particular type of plug-in to watch that video. But in reality, these plug-ins might be malicious software that can steal your sensitive information.

Booting Data from Unknown CDs

Malicious software can get into your device through an unknown CD. A good practice to be safe from malicious infection is to remove CD when your device is not working at all. Your system could reboot the CD if it is not removed before switching off the computer.

Bluetooth

Bluetooth transfers can also infect your system, so it is crucial to know what type of media file is being sent to your computer whenever a transfer takes place. An effective armor would be to allow Bluetooth connectivity with only known devices and activate it only when required.

Unpatched Software

Often overlooked, unpatched software is also a leading source of virus infection. Security holes in software are exploited by attackers and are unknown to software makers until the attackers release them in the form of zero-day attacks. It is therefore recommended to install software updates as soon as they are available on your PC.

Software review series: Visual studio code

Visual studio code is a code editor available for Windows, Linux, and macOS. It is a completely free tool offering you to code in any language without the need to switch to another editor. Visual Studio Code is part of Microsoft Visual Studio which is a complete integrated development environment (IDE). Take notice that Visual studio itself has more advanced tools for developing and testing, it has 24/7 support, training, and Azure for WEB apps. Visual Studio Code is an editor lacking in some advanced features Visual Studio offers.

Visual Studio code Price and royalty

As mentioned Visual Studio code is completely free licensed under the MIT license agreement giving you the tool free to use and sell your product. How it supports Linux, Windows, and macOS, all you need it to go to its official page https://code.visualstudio.com/, download it and start using it. How this is free project backside is that there is no official support, you will have to rely on various articles and community in order to get needed information or problem solution.

Features

Syntax highlighting has become standard and norm for any editor but besides this function VS code offers us also IntelliSense option which goes a step further with code completion, code hinting, and parameter info. This means that VS code is aware of many things going on inside your code and will offer you as you type a menu with options for autocomplete along with variables referenced, function names, etc. VS code offers extensions inside its extensions marketplace where you can add extensions in order to implement new languages, add debuggers, change the layout, etc. This is one of the great features it allows you to easily switch from one project to another, one language to another not leaving your code editor. Working with version control systems like Git is easy with VS Code. You’ll be able to stage files and make commits, then push and pull changes to your remote code repository of choice, right from the editor.

Conclusion about Visual Studio code

Visual Studio Code is one of if not the most flexible and extensible code editors currently on the market that I have ever tried and used. IT has become my code editor of choice simply for reasons that there is really not much it cannot do and it is constantly updated and taken care of. You can really tune it to look and feels how you want with extensions and you really cannot beat the free price tag. I would highly recommend this editor for daily use especially since its biggest competitors like Atom and sublime text have not seen many updates lately.

Runtime Error How to Fix

A runtime error is commonly an error that's created after the PC is operating software and encounters a problem of some form. For instance, a runtime error like run-time error code 7 reveals an "out of memory" dilemma.

Solution

Error Cause

Run-time errors are normally brought on by clashes with TSR (Terminate and Stay Resident) applications or additional operating applications, software problems, storage problems, or pc viruses.

Troubleshooting a Run-time Error

First, enter the run-time error signal into a search engine to see what info you will get about the precise runtime issue you are receiving. Next, end - job all running applications and TSRs to make sure these aren't the origin of the issue. You can certainly do so by obtaining the job manager by striking Control Alt Delete.

In case your issue is regularly occurring with a unique program, go to that system programmer's site and obtain any upgrades and patches. If unavailable, try uninstalling the application involved and reinstalling it.

In the event the issue is occurring with the os, you may consider reinstalling it although it is a huge commitment. A much better idea would be to try a fix for both Windows XP or Windows 2,000. It is possible to fix and scan files by typing : sfc / scannow, heading to the Begin switch, Run, and then pushing enter. Make certain to put an area between sfc and the reduce.

You might have an equipment or storage dilemma if these measures have not resolved your run-time errors. If that is the situation, contact the support of the application under consideration for potential support accompanied by the pc or motherboard manufacturer.

Many run-time problems can be solved by upgrading the application that's creating the problem. This is only because the programmer's frequently releasing patches and improvements for their applications as insects are found and repaired.

Storage problems may frequently be fixed by rebooting the pc. Consider a reboot a short-term repair. Rebooting clears the memory but in case your COMPUTER does not have adequate memory for your applications you're operating, or sufficient hard-drive space you'll immediately run out of memory again. Something less than this sum may cause memory issues since the computer's swap file isn't in a position to expand in dimension as required.

To assess the quantity of free area, available My Computer and right-click on the HDD, generally the D: drive. Select Attributes in the menu and see the disc's ability. Perform the disk clean-up function by following prompts and pressing the Disk Clean-up button, if the room is reduced.

You may be getting run-time errors, in case your storage chip is really failing. Eliminating and changing the awful memory chip will solve the difficulty. If you're encountering other runtime-related errors, like an install runtime issue, try cleaning away the portions of the registry with some software solution.

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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