How to place different wallpapers on 2 screens

One of the most common ways cybercriminals use to inject suspicious code into devices is by tricking users into installing a malicious program on a targeted device. Oblivious users are vulnerable to such tricks, which is why Microsoft has been working hard in the background to address this issue. Recently, Microsoft announced the availability of a sandboxed version of Windows 10 that runs inside Windows 10 in order to isolate suspected software to run inside it and protect the system from potential threats. This Windows Sandbox feature is a new feature that keeps your computer secure. It is a virtual disposable environment that you can enable. So if suspect any software of being malicious, you can run this software in an environment and ensure that it won’t interfere with any normal processes and would not jeopardize files on your computer. To simply put it, “Windows Sandbox is a new lightweight desktop environment tailored for safely running applications in isolation”. So if the Sandbox is closed, all the residual files, software, and other data are deleted permanently. To enable Windows Sandbox, refer to the instructions provided below. Step 1: You have to make sure that you are running either Windows 10 Enterprise Editions or Windows 10 Pro and that your computer is running build 18305 or newer. Step 2: After that, you have to enable Virtualization to let another instance of Windows 10 running in Sandbox mode. Step 3: Next, search for Windows Features on and off in the search box and then select the appropriate entry. Step 4: From the list, go to the mini window and check the Windows Sandbox and then click on OK. Step 5: Afterwards, in the Cortana Search box, search for “Windows Sandbox” and select the related entry to run it in an elevated window. Step 6: Then from your main computer (host), copy the executable file and paste it inside the Windows Sandbox environment. Step 7: Now run the executable file in the Sandbox environment and use it as you normally do. Step 8: Once you’re done, close the Windows Sandbox application and as mentioned, every data regarding the executable file and the temporary environment will be deleted. Step 9: And for the sake of safety, ensure that there are no modifications made to the host because of the executions in the Sandbox environment. You have the option to contact Microsoft for feedback related to Windows Sandbox. You can use the traditional Feedback Hub if you have any suggestions or any issues. Just fill in the appropriate details and select Windows Sandbox for the feature category under the Security and Privacy section. And if you have any issues related to the execution of and within Windows Sandbox, simply choose “Recreate my problem” then select Start capture to reproduce the issue, and once you’re done, select Stop capture.

The latest steam beta update has introduced code that will prevent downloading and installing previous game versions via the steam client. For many people that are playing online games, this is not such a big deal since they always must have the latest version in order to play their games but for other ones, this has arrived as a bit of a problem. Many people preferred older game versions since often updates can change certain mechanics inside the game making it different as an experience or introduce some elements that not everyone likes. So far, people could use the steamDB site to find depo of the game versions you would like to play and download it but if this beta code goes live that will not be an option anymore. Now, playing old games without updates could also be used for nostalgic reasons and these people have also been cut off with this update. It is important to point that update is still in beta client only but users have already started to voice their opinions asking Valve not to place it live. In the end, it will all depend on Valve’s decision will they listen to their customers or decide to push updates on live service.

Error Code 0x80070020 – What is it?

One of the problems encountered by Windows users when upgrading to Windows 10 from Windows 7 or Windows 8/8.1 is the Error Code 0x80070020. This error code normally occurs when users try to download updates from the Windows Update Website or simply by upgrading to Windows 10. Error Code 0x80070020 also occurs when the device already has a Windows 10 installed.

Once this error is encountered, it will cause malfunction of update installs and display the following message:

An error (-5006 : 0x80070020) has occurred while running the setup. Or The process cannot access the file because it is being used by another process”

Solution

Error Causes

In an attempt to fix Error Code 0x80070020, it is important to pinpoint what the cause is. The most probable cause of this error is due to interference. This error code most likely occurs when there is another automatic update running, for instance, an Antivirus scanning in real-time. If you’re scheduled to have an automatic update during real-time scanning, the Windows 10 update might malfunction.

Further Information and Manual Repair

In trying to fix Error Code 0x80070020, you can perform manual repair methods to resolve the issue effectively and efficiently. Most Windows users can easily employ these manual repair methods, even those who do not have technical abilities. However, there are certain instances where a Windows professional’s help is needed. If you don’t want to face any risk in resolving the issue, it would be best to consult a professional Windows technician or you can also make use of a powerful automated tool.

NOTE: It is best to attend immediately to errors encountered since unresolved errors can result in slowing down your computer’s performance. This might also cause other error messages to arise such as Error Code 0x80070057.

Method One: Restart Your Device

Since Error Code 0x80070020 is most likely encountered due to interference during your update, the easiest method you can do is to close all opened programs and restart your device. After restarting, try to start the update process again.

Method Two: Disable Antivirus Temporarily

Another quick and safe way to fix Error Code 0x80070020 is to disable your antivirus. You must take note though that in doing so, your computer will be susceptible to virus attacks. If you want to proceed with this method, follow these steps:

1. Locate all programs in process in the notifications area, found in the lower right-hand section of your screen. If in case the antivirus icon is not visible on the taskbar, you may have to click an arrow pointing up to show what programs are currently running.
2. Right-click on the antivirus icon then select the disable option.

Method Three: Run the Update Troubleshooter for Windows

The Windows Update Troubleshooter may resolve many of the errors encountered by Windows users when installing updates from Windows Update. To execute the troubleshooter, follow the steps below:

1. Access a menu by holding the Windows key and X. Wait for the menu to appear on the bottom left corner of the screen.
2. Open the Control Panel.
3. Change the appearance of files by selecting large or small icons in the View by option located on the upper right section of your screen.
4. Once you change the appearance of the files, choose the troubleshooting
5. Run the Windows Update Troubleshooter.
6. Restart your device then check if this resolves the problem.

Method Four: Execute A Clean Boot

Executing a clean boot means starting Windows using only a few resources, including startup programs and drivers. This safeguards minimizing conflicts and prevent software clash when an update is received. In performing a clean boot, you will be able to pinpoint what caused the manifestation of error code 0x80070020. Check Microsoft’s Support website to know how to execute a clean boot.

Method Five: Reset Windows Update Components

Performing this method is a bit risky and should be your last option if all methods were unsuccessful. This process will alter your device’s registry so you must ensure to perform accurately the steps. A single mistake can lead to modifying your registry erroneously, which might result in the occurrence of other error messages. Carefully follow the steps found on Microsoft’s Support website to successfully reset Windows Update components.

Resetting Windows Update components can also be done by implementing the following steps:

1. Open the Command Prompt by pressing Windows Key + X. Select Command Prompt (Admin) from the menu.
2. Stop the BITS, MSI Installer, Cryptographic, and the Windows Update Services.
3. Rename both the SoftwareDistribution and Catroot2 folders to <name of folder> old.
4. Start now the BITS, MSI Installer, Cryptographic, and the Windows Update Services.
5. Exit the Command Prompt then restart your device. After restarting, try installing the updates again.

Method Six: Disable Third-Party Antivirus

A third-party antivirus such as BitDefender may recognize the Windows Update as a threat since the new update of Windows 10 is probably not yet registered with this third-party antivirus vendor. To solve this, you must disable temporarily the antivirus before performing the update. Once the third-party antivirus is disabled, you can now proceed with the updating process. Update as well your third-party antivirus.

Method Seven: Use the DISM Tool for Windows 10

The Deployment Image Servicing and Management (DISM) is a command-line utility that is installed by default in Windows 10 system. This program is used to fix images in Windows. In the case of Error Code 0x80070020, the DISM can repair the recovery image in Windows 10 and can perform as a virtual hard disk as well.

1. Scan and check files for errors.
2. Open the Command Prompt by pressing Windows Key + X. Select Command Prompt (Admin) from the menu.
3. Type sfc /scannow
4. You can also use the following commands to check for corrupted files:

/CheckHealth – to check for corrupted files or components

/ScanHealth – to check for corrupted Windows image. This may take up to 10 minutes to finish

/RestoreHealth – to check for corrupted Windows image and do an automatic repair. This may take up to 20 to 30 minutes to finish

NOTE: In an instance where you cannot locate the good files in your computer, the system image files may be corrupted. If this happens, you need to have a copy of install.wim from a computer with good Windows 10 OS or the Windows 10 ISO file. Make sure that the source of the good files has the same language, version, and edition of your OS.

Cleaning corrupted files using DISM utility:

Enter the following commands one by one to perform the /RestoreHealth switch using the source path location of good files you copied:

1. DISM /Online /Cleanup-Image /RestoreHealth /Source:repairSource install.wim
2. DISM /Online /Cleanup-Image /RestoreHealth /Source:repairSource install.wim /LimitAccess
3. DISM /Online /Cleanup-Image /RestoreHealth /Source:repairSource install.wim:1 /LimitAccess

For example purposes, the “repairSource” is the source of the good files.

As you know, Excel sheet is frequently acclaimed as one of the most useful software that allows users to create spreadsheets, crunch numbers as well as prepare a business report. Usually, tapping the arrow keys to move from one cell to another. However, there are times when you might experience trouble in tapping them – for instance, they won’t work when you tap them. This kind of problem can be quite frustrating since no matter what you do, especially when you tap the arrow keys, instead of a single cell, it moves the entire spreadsheet. If you are one of the users who experience this problem, worry no more for this post will guide you on what you can do to fix it. When arrow keys won’t function as intended in Excel spreadsheets, it could be due to unintended behavior of the Scroll key or it could be related to some issues with the keyboard driver. Whatever the cause is, here are some suggestions you can check out to fix it.

Option 1 – Try to disable the Scroll Lock

The first thing you can do to fix this problem with arrow keys is to disable the Scroll Lock. Although doing this is easy, newer laptops don’t actually come with it so if your keyboard does not come with a scroll key, all you have to do is tap the Fn key and disable Scroll Lock. Aside from that, you could also use the on-screen keyboard to turn off the Scroll Lock. You will see its status on the Excel sheet which will help you to double-check. Moreover, you could also tap the Shift + F14 keys to toggle off the Scroll Lock. To use the on-screen keyboard to turn off Scroll Lock, follow the steps below.

• Tap the Windows key and type “on-screen keyboard” and then tap Enter.
• Once the on-screen keyboard is opened, you should see that the Scroll Lock is on the “On” position since the ScrLk keys are in blue.
• Like pointed out earlier, you can utilize the Scroll Lock indicator located in the status bar as well as disable or enable the scroll key by using this feature on Microsoft Excel.

Option 2 – Try turning on the Sticky key

If disabling the Scroll Lock did not fix the problem, you can try turning on the Sticky Key instead. A lot of users reported that this option fixed the problem for them. So you should try to turn on the Sticky key and to do that, follow the steps below.

• First, type “control panel” in the Start Search and click on Control Panel from the search results.
• Next, select the “Turn On Sticky Keys” option and click on OK.
• After that, go back and uncheck the “Turn On Sticky Keys” option. This should fix the malfunctioning arrow keys on Excel.

Option 3 – Try running the Hardware and Devices Troubleshooter

The first thing you can do to fix the problem is by running the Hardware Troubleshooter. Although it won’t make much of a difference, there’s still a possibility that it could automatically fix the problem with these function keys. To use it, refer to these steps:

• The first thing you need to do is click on Start and then on the gear-like icon to pull up the window for Settings.
• After opening Settings, look for the Update and Security option and select it.
• From there, go to the Troubleshoot option located on the left-hand side of the list.
• Next, select Hardware and Devices from the list and open the Troubleshooter and run it. Once it is doing its job, wait for it to complete the process and then restart the system.
• After the system restarts, check if the problem’s now fixed. If not, refer to the next option given below.

Option 4 – Update the keyboard driver

You can also update the keyboard driver to fix the problem. There are cases when an outdated or corrupted driver can fix the problem. To do so, follow the steps below.

• Tap the Win + R keys to open the Run dialog box.
• Then type “devmgmt.msc” in the field and hit Enter to open the Device Manager.
• From there, look for the keyboard driver and click on it.
• Next, right-click on the keyboard driver and select the Update driver option.
• After that, click the “Search automatically for updated driver software” option to proceed.

Option 5 – Reinstall the keyboard driver

If updating the keyboard driver didn’t help, then you might want to reinstall it. How? Follow the steps below.

• 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. Look for the keyboard driver, right-click on it and then select “Uninstall device”.
• After that, unplug the device and restart your PC.
• Then plug your device back in. Assuming your device is connected to your PC, open the Device Manager again.
• Next, click on the Action button and click the Scan for hardware changes button. That should fix the problem

Note: You could also completely uninstall the driver and go directly to the manufacturer’s website and download the latest driver for your hardware and then install it.

As you know, one of the basic apps in the Windows 10 operating system is the calculator and it can even be extended to a scientific calculator which makes it really useful for users. However, there are instances when you might encounter some issues while using this app. One of the issues about the Calculator app that’s been reported recently is that the Calculator app is not working. If you encounter the same problem, then you’ve come to the right place as this post will guide you on what you can do to fix the problem. Based on the reports, users claimed that the issue with the Calculator app occurred right after they’ve installed a feature update, while other users claimed that the Calculator app never really worked on their computers and there are also cases where the app opens but it either freezes or crashes. According to researchers, the main causes of the problem include a feature update that could’ve altered the settings. It could also be due to problems with the login account or corrupted and missing files, or the problem could also with the calculate app itself. To resolve this problem, here are some suggestions you can follow.

Option 1 – Run the System File Checker Scan

System File Checker or 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 to good system files that might be the reason why the calculator app is not working properly. 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

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:

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

• Reboot your computer.

Option 2 – Run the DISM tool

You can also run the DISM Tool as it helps in repairing the Windows System Image as well as the Windows Component Store in Windows 10. Using this built-in tool, you have various options such as the “/ScanHealth”, “/CheckHealth”, and “/RestoreHealth” that could help in fixing the Calculator app.

• Open the Command Prompt with admin privileges.
• Then type in the following commands and make sure to hit Enter right after you type each one of them:
  • Dism /Online /Cleanup-Image /CheckHealth
  • Dism /Online /Cleanup-Image /ScanHealth
  • Dism (.)exe /Online /Cleanup-image /Restorehealth
• Do not close the window if the process takes a while as it will probably take a few minutes to finish.

Option 3 – Try logging into your computer using a different User Account

You might want to try logging into a different User Account since it is possible that the issue could have something to do with your log-in account. Thus, you can isolate this possibility by logging into a different user account. If you don’t have any other user account, simply create a new one by clicking on the Start icon and then go to Settings > Account > Family & other users. From there, go to the Other user's section and click on the Add someone else to this PC option, and then inputs all the needed information and restarts your computer. Once your computer has restarted, log into your computer using the newly created user account.

Option 4 – Try to reset or reinstall the Calculator app

If the first three given options didn’t work, you might want to reset or reinstall the Calculator app. To do that, follow these steps:

• Click on the Start button and go to Settings > Apps > Apps and features.
• Next, look for the Calculator app from the app list and click on it to see its other options.
• After that, select the Advanced options and go to the Reset section and then click on the Reset button to reset the Calculator app.

Note: You also have the option to reinstall the Calculator app. All you have the option to visit Microsoft Store and from there, uninstall the Calculator app.

If you are trying to run Windows Upgrade on your Windows 10 computer but suddenly interrupted by the error 0x800F081E – 0x20003, worry not for this post will guide you on how you can fix this Windows Upgrade error. This particular Windows Upgrade error is a Windows status code for CBS_E_NOT_APPLICABLE which indicates that some of the update requirements are missing or the files that are installed are already of a higher version compared to the ones that are still pending. In most cases, this error occurs when you try to upgrade to earlier versions of the Windows 10 N edition to a later version. Here’s the full content of the error message:

“0x800f081E-0x20003, The installation failed in the SECOND_BOOT phase with an error during BOOT operation”

In case you don’t know, Microsoft distributes special “N” editions of Windows in Europe and the “KN” editions in Korea. These editions are the same as the standard editions of Windows except that they do not have the Windows Media Player as well as the multimedia playback features. Thus, when the Windows Upgrade fails with the error code and error message and it doesn’t provide much information as to why the update couldn’t be installed, there is something you can do about it to fix the error. Since Windows uses generic error codes and so if you see the error code 0x800f081e, you have to check the error log first. For more details, follow the instructions laid out below. Step_1: You need to navigate to C:$WINDOWS.~BTSourcesPanther and from there look for the text file named “setuperr.log” and open it with a text viewer/editor program like Notepad. Step_2: After opening the setuperr.log file, you should see content that’s similar to this:

C:WINDOWSSoftwareDistributionDownload80b2677d6e15a2a206625bb25a7124feamd64_Microsoft-Windows-MediaPlayer-Package~~AMD64~~10.0.17134.1. Error: 0x800F081E 2019-09-10 20:26:57, Error SP Operation failed: Add [1] package C:WINDOWSSoftwareDistributionDownload80b2677d6e15a2a206625bb25a7124feamd64_Microsoft-Windows-MediaPlayer-Package~~AMD64~~10.0.17134.1. Error: 0x800F081E[gle=0x000000b7]

Note: From the content above, it is clear that the Windows Upgrade failed due to complete due to the Windows Media Player. It could be that the log file may contain other error messages and other error codes and if you see the error code 0x800f081e from the list, then you need to uninstall the Media Feature Pack. Step_3: You have to uninstall the Media Feature Pack.

• Tap the Win + R keys to launch the Run dialog box and type “optionalfeatures.exe” in the field and hit Enter to open the Windows Features wizard.
• Next, you need to wait until the list of Windows Features populates and then click on the + sign to collapse the folder of the Media Features.
• After that, uncheck the “Windows Media Player” option from the Media Features folder.
• Now click on the Yes and OK buttons to save the changes made and then close the Windows Features dialog box.
• Restart your computer and boot, try to run the Windows Upgrade process again, and check if the error is fixed or not.

Note: If the installation has been successfully completed, you have to go back to the Windows Features and enable the Windows Media Player again. And if you are using the Windows 10 N Edition, then you can just download and install the latest version of the Media Feature Pack for your Windows 10 N edition. On the other hand, running the built-in Windows Update troubleshooter could also help you resolve any Windows Update-related problems, including the error 0x800F081E – 0x20003. To run it, go to Settings and then select Troubleshoot from the options. From there, click on Windows Update and then click the “Run the troubleshooter” button.

As you know, the Microsoft store is a built-in tool in Windows 10 where you can find a variety of applications. It helps users in downloading or updating apps in the system. However, there are instances when you could encounter issues while using it. One of the issues that you could face when using the Microsoft Store app is when it keeps on offering apps you have just updated or when you are not able to update any apps at all. This kind of issue in the Microsoft Store app might be caused by other issues like a damaged Windows Store cache. There are several options you can check out to resolve the problem. You can try to check the registry setting or run the Windows Store apps troubleshooter or clear the Windows Store cache manually or reset its settings. You could also try to re-register the Microsoft Store app. For more details, refer to each one of the options provided below but before you troubleshoot the problem, make sure that you create a System Restore point.

Option 1 – Run the Windows Store App troubleshooter

The Windows 10 Store Apps Troubleshooter will help you in fixing the problem in Microsoft Store. This is a great built-in tool from Microsoft that helps users fix any app issues. To use the Windows Store Apps Troubleshooter, follow the steps below.

• Tap Win + I keys again to open the Windows Settings panel.
• Go to Update & Security and then go to Troubleshoot.
• Under the Troubleshoot section, on your left-hand side, scroll down to find Window Store Apps.
• Then click on the Run the troubleshooter option and follow the on-screen instructions and then see if it fixes the problem.

Option 2 – Try checking the settings in the Windows Registry

The next thing you can do to fix the problem is to check the Registry settings for the Windows Store.

• Tap the Win + R keys to open the Run utility and type “Regedit” in the field and then hit Enter to open the Registry Editor.
• Next, navigate to this registry path: HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionCurrentVersion
• From there, look for the DWORD named “CurrentVersion” and make sure that its value data is set to 6.3, but if it’s not then change its value data to 6.3
• Exit the Registry Editor and restart your computer and then see if it fixed the problem with the Microsoft Store app.

Option 3 – Try to reset the Microsoft Store cache

Just like browsers, Microsoft Store also caches as you view apps and games so it is most likely that the cache is no longer valid and must be removed. To do so, follow the steps below.

• Right-click on the start button and click on Command Prompt (administrator).
• Next, type in the command, “exe” and tap Enter. Once you do, the command will clear the cache for the Windows Store app.
• Now restart your PC and afterward, try opening Microsoft Store again and then try to install your app or update your computer again.

Option 4 – Try to re-register the Microsoft Store app via Windows PowerShell

• Tap the Win + X key combination or right-click on the Start button and click on the Windows PowerShell (Admin) option.
• If a User Account Control or UAC prompt appears, just click on Yes to proceed and open the Windows PowerShell window.
• Next, type in or copy-paste the following command to re-register the Microsoft Store app and tap Enter:

powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRootWinStoreAppxManifest.xml

• Wait for the process to be completed and then restart your computer.

What is error 0x800ccc17?

This is a typical Outlook Express error code. Outlook Express is email software by Microsoft. This error may pop up when sending or receiving emails on your Outlook Express. It cancels email sending and receiving operations. In other others, the 0x800ccc17 error code hampers your email communication via Outlook Express account. This error message is displayed in the following format:

0x800CCC17 - User cancelled operation

Solution

Error Causes

0x800ccc17 error code may appear on your PC due to multiple reasons. These include:

• Issues with Pop3uid.dbx file (this file supports Outlook Express software on Windows Vista)
• Viral infection
• Registry corruption

No matter what the underlying reason for this error code may be, it is advisable to resolve the issue right away without any delay. This error may cause great deal of inconvenience. It may lower your office productivity badly especially if you interact and communicate with people of other office departments via your Outlook Express account.

Further Information and Manual Repair

Here are some of the best and efficient do-it-yourself methods to resolve the 0x800ccc17 error code on your system. These methods are very easy to work around and do not require any kind of technical expertise.

Method 1 - Restart Your PC

Sometimes this might error can be resolved by simply rebooting your system. So, restart your PC and try using your Outlook Express account again. If it works, the error is resolved. However, if it persists then try other methods given below.

Method 2 - Rename pop3uid.dbx File on Your System

If the underlying cause of error 0x800ccc17 is related to pop3uid.dbx file damage, then simply rename it to resolve. This can be done by searching for the file pop3uid.dbx. After locating it rename it to ‘pop3uid.bak’. Now reopen Outlook Express and try sending or receiving emails again. If the operations are executed successfully then the error is resolved.

Method 3 - Remove Viruses

Viruses can infect your PC without you knowing about it. These malicious programs usually enter your system through phishing emails and file downloads. If the error 0x800ccc17 is triggered due to viral infection then it is advisable to install a powerful antivirus and remove all viruses from your PC.

Method 4 - Repair the Registry

If you don’t clean the registry frequently it fills up with unnecessary and obsolete files like junk files, cookies, internet history, and bad registry entries. These files then corrupt and damage the registry thereby generating codes like error 0x800ccc17. To resolve this, you first need to remove all these unnecessary files and repair the registry. Though this can be done manually if you are not technically sound, it may be time-consuming and slightly tricky. Therefore it is advisable to download Restoro. This is a powerful registry cleaner that wipes away all obsolete files instantly, cleans the registry, and repairs it in seconds. Click here to download Restoro and fix error 0x800ccc17 on your PC today.

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.

Disk cleanup is part of Windows 10 tools and it is essential in keeping your computer up and running in optimal settings and to free so much needed space as well as remove temporary files that can accumulate over time. Using disk cleanup from time to time is recommended and a very useful habit that will save you some headaches and optimize your computer running time, speed up boot sequence, etc. Think of it like cleaning up your desk, from time to time it can get too overwhelmed with junk and non-important things and if you are keeping it tidy all the time each time you need to find something it will be much faster and easier, same goes with computers, so if you do not have it, try to develop a habit that once per month you start disk clean up and remove trash from your hard drive. In order to do so, press ⊞ WINDOWS + E to bring File Explorer up Once File Explorer is up and running right-click on the hard drive you wish to run disk cleanup on and click on properties. Properties Windows will open on the general tab, on that tab you have disk cleanup on the lower right part of properties, click on it. Wait for Windows to gather information about your hard drive and files on it. After it is finished you will be greeted with the next screen: Here you can thick and mark which items you would like to get rid of and which ones you would like to keep. Note that you can freely tick all of them and remove them since removing these files will not break WIndows in any way. make your choices and click on ok. You can also click on Clean up system files to run system files cleaner and get rid of junk there, you will not be able to choose any options there, Windows will alone clean up what is not needed. After disk cleanup is finished least thing you will have is more free disk space, but like mentioned, keeping your Windows and computer healthy goes a long way in its usability, speed, and performance.