How to Remove MovieGoat - Malware Removal Guide

The Windows Defender program can both scan and monitor almost the entire folder on a Windows 10 computer. So if you have a folder that may have files that could trigger an alarm to Windows Security, then it would be better if you add an exclusion to Windows Security. Note that it is okay to do this as long as you’re certain that the contents of the folder you want to exclude are safe and that Windows Defender is only throwing out warnings for nothing. This way, Windows Defender won’t scan those folders in the future. And besides, there are also some Windows folders and files that you may exclude from the Antivirus scans, especially if you want to save your scan time. This kind of feature also comes in handy when you trust a file type or folder or any process that you believe is safe but the Windows Security considers as malicious. To exclude a folder or a file or process or a file type from the Windows Security scan, here are some steps you can follow. Make sure to do them carefully. Step 1: Search for “Windows Security” in the Search box and then click on it from the search results to open it. Step 2: Next, click on Virus & threat protection > Manage settings > Add or remove exclusions. Step 3: After that, on the next screen, click on Add an exclusion > Folder. It will show you a list that includes File, Folder, File Type, and Process. Step 4: Now click on “+Add and exclusion” on the next window and then select a folder you want to exclude and click OK to add it in the Exclusions list. Step 5: Click on the down arrow button to remove it and then click on the Remove button. Note: If you want to only ignore a few file types, it’s better if you configure your antivirus program to ignore these files with a specific extension. This way, it will ignore all of them no matter what their location is. Also keep in mind that when you select a folder, all the subfolders in it will also be excluded from the scan. Thus, you need to understand what you’re about to do. Once you’re done excluding the folder, it is recommended that you protect the folder using the Controlled Folder Access since this folder is not monitored for threat. The Controlled Folder Access will ensure that an external program does not alter it. This way, you can be sure that even though this folder is not included in the scan, it is still secure.

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:

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.

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.

Code 24 - What is it?

You may experience error code 24 when you try to use a device on your PC that is not properly installed or its driver is corrupted. Code 24 is a Device Manager error and it pops up on your computer screen in the following format:

“This device is not present, is not working properly, or does not have all its drivers installed. (Code 24)”

Solution

Error Causes

Error code 24 may be triggered due to several reasons. However, the most common causes for this error code include:

• Incorrect device installation
• Hardware failure/ conflict
• Corrupted or outdated driver
• Device prepared for removal

It is recommended to resolve the error code to ensure your PC works at its optimal performance. Error code 24 can lower the device functionality and PC performance dramatically.

Further Information and Manual Repair

Since this error code can mean several different things, troubleshooting it can be quite tricky but to make it simple to resolve, we have listed down some easy methods to repair error code 24.

Try these methods to fix error 24 on your PC and ensure your system works at its optimal pace. Let’s get started….

Method 1 - Update the BIOS on Your Motherboard

Problems with BIOS, the controlling software in the PC motherboard, can sometimes trigger hardware conflicts resulting in Device Manager error code pop-ups.

In such a scenario, it is advisable to update BIOS. To update, go to your PC motherboard manufacturer’s website. Here you will be able to find instructions on updating BIOS.

Follow the instructions carefully to resolve error code 24 on your system. If the error code still persists, then try other methods discussed below.

Method 2 - Remove New Devices

If you experienced code 24 on your PC after installing new devices, then it is advisable to remove them to resolve the error code.

If the device is attached to your computer, then simply disconnect and remove it immediately. Once you disconnect it, reboot your system to activate changes.

Method 3 - Update Drivers

If device removal does not resolve the problem, then consider updating the device driver. Code 24 is also related to driver problems.

It can occur if a device driver is corrupted or outdated. In such an event, it is advisable to update the driver by installing the new and latest device driver version on your PC.

For doing this, simply download the latest device driver version from the manufacturer’s website and update it.

Method 4 - Install DriverFIX for Both Device Driver Update and Safe Device Removal

Finding problematic drivers and the latest device driver versions to update them, however, can be time-consuming and sometimes even frustrating. To avoid being in this situation, it is advisable to download DriverFIX.

DriverFIX is a cutting-edge, user-friendly and an innovative program exclusively designed to resolve device driver related issues and problems on computer systems

It is integrated with the newest technology and intelligent programming system that enables and empowers PC users like you to repair device driver error codes in seconds.

Once you install this software on your PC, simply run it. The software program instantly detects all problematic drivers and updates them with their latest versions available on the internet.

All this is done in mere seconds and it’s not time-consuming at all. Moreover, device driver updates are performed frequently to ensure that you don’t experience any driver problems again.

• With this software on your PC, you don’t have to worry about updating drivers regularly.
• In addition to this, as we discussed above, driver code 24 can also occur due to new plugged-in devices. If that’s the reason, then DriverFIX can help you resolve this problem too.
• It can help you manage and unplug USB devices safely from your PC. After installing DriverFIX, unplugging USB devices is easy and you don’t have to worry about data corruption or drive damage.
• DriverFIX manages USB devices smoothly by making the ejecting process easy and safely removes hardware from your PC, thereby resolving error code 24 in no time.
• DriverFIX is easy to install and use and is compatible with all Windows versions.

Click here to download DriverFIX and repair Device Manager error code 24 right away.

If you encounter an error message that says, “<Drive>: is not accessible, The File or directory is corrupted and unreadable” when you try to connect your USB or external device, then the File System could have been corrupted or the external device might be infected with malware. On the other hand, it is also possible that the device might have some physical damage. To fix the “The file or directory is corrupted and unreadable” error, you can try to run Check Disk or scan your computer for malware or you could also format the destination drive. For more details, refer to each one of the given options below.

Option 1 – Run the Check Disk utility

You can also run the Check Disk utility to fix the error when you connect your USB or external device.

• In the Windows Search box, type “command prompt” and from the search results, right click on Command Prompt and select “Run as administrator”.
• After opening Command Prompt, type this command and tap Enter: chkdsk <Partition Letter>: /f /r /x /b
• The command you entered will start to check for errors and fix them automatically. Else, it will throw an error message saying, “Chkdsk cannot run because the volume is in use by another process. Would you like the schedule this volume to be checked the next time the system restarts? (Y/N)”.
• Tap the Y key to schedule Disk Check the next time your computer restarts.

Option 2 – Try to format the destination drive

Formatting the drive can also help you resolve the error. To format it, follow these steps:

• To get started formatting your drive, tap the Win + E keys and then go the access page of the drive.
• Next, right click on the drive and select Format.
• After that, uncheck the “Quick Format” option and then format your drive properly.
• Now once the formatting process is finished, unplug the drive and plug it back in afterwards.
• Check if the error is already fixed. If the drive is not initialized, tap the Win + R keys and hit Enter.
• After opening the Run dialog box, type “diskmgmt.msc” and hit Enter to open Disk Management.
• From there, right click on the drive volume and select initialize Disk.
• Next, select the correct partition type and proceed.

Option 3 – Try scanning your computer for malware using Windows Defender Your computer could be infected with malware which might have triggered the “The file or directory is corrupted and unreadable” error. To fix this, you need to scan your computer using a reliable program like Windows Defender.

• Tap the Win + I keys to open Update & Security.
• Then click on the Windows Security option and open Windows Defender Security Center.
• Next, click on Virus & threat protection > Run a new advanced scan.
• Now make sure that Full Scan is selected from the menu and then click the Scan Now button to get started.

RAM drive is basically a hard drive made of your RAM memory. Altho this kind of drive can not and is not available to save any data when the computer is shut down its advantage is lightning fast speed since the application is installed in RAM itself, it is loading from there and executing from there. Creating this kind of drive which will use your RAM memory, well part of it can not be done natively in Windows, you will need some kind of application for this task. Luckily there is a free open source application for this kind of task. ImDisk, you can download the application here. ImDisk Toolkit is an application for managing virtual drives. It also includes a utility that allows the creation of RAM drives. Download the application and install it, make sure that you select all components on the installation selection screen. After installation is finished double click on icon labeled RamDisk Configuration. Once the application is running adjust the disk size in the box at the top of the window for your RAM drive. Click “OK” at the bottom of the window. This will create your RAM drive, which is just a virtual disk that’s assigned to your computer’s RAM. The process happens transparently, so there’s nothing you need to do. If you get a warning about shutdown settings, click on the “Shutdown Settings” button. Then unlock the settings pane with your administrator password. Finally, uncheck the checkbox next to “Turn on fast startup (recommended)” and click “Save Changes” at the bottom of the window. Your RAM drive is now ready for use. Fast Startup speeds up the process of turning on your computer by saving a system state between completely off and hibernation to your hard drive. This happens when the computer writes the contents of your RAM to a stable hard drive. As you may guess, this could mess with your RAM drive’s ability to preserve and track its data. With Fast Startup off, boots may take slightly longer, but it’s doubtful that you’ll notice much. Disabling a fast startup will satisfy the warning window, but let’s consider why. This will also allow ImDisk to save your RAM drive’s data to an image file when you shut down your computer. If you don’t, the contents of your RAM drive will be erased completely every time, with no saved image storage. It would also disable the RAM drive’s ability to load the previous content. Basically, the drive would act much more like RAM and much less like a disk. Depending on your use case, that may be disappointing or unusable. You can access and use it just like any normal hard drive. It shows up in Windows’s file explorer just like any other drive. However, a Ram drive is exponentially faster than traditional types of storage. And we mean exponentially. Whereas an SSD might offer 300 to 500 MB when reading from the disk, a RAM drive can offer more than 5000 MB, even on mediocre memory sticks.

Could not connect to the System Event explanation: Although logging into a Windows 10 computer may seem like a simple process, it’s actually not since the Windows operating system has built a mechanism in a way that any third party or malware intervention would not compromise access to the system. This mechanism is supported by numerous services, functions, and DLL files. And Microsoft has been taking this security to a whole new level with the introduction of Windows Hello. Recently, a number of users reported getting the “Windows could not connect to the System Event Notification Service service. Please consult your system administrator” error when logging into their computers. While some users also reported that although they can log in, they encounter the same error message from the Notification area. There are several options you can check out to resolve the error. You have to check the status of several Windows Services and make sure that they are running. You also have to reset Winsock as well as run the System File Checker scan.

Option 1 – Check for certain Windows Services

• First, you need to tap the Win + R keys on your keyboard to open the Run dialog box.
• Next, type “services.msc” in the field and click OK or tap Enter to open the Windows Services Manager.
• After that, you will see a list of services and from there, look for the following Windows Services:
  • DHCP Client
  • System Event Notification Service
  • Windows Font Cache Service
• Now make sure that the Startup Type of each service is started and running.

Option 2 – Try resetting the Winsock drivers

• In the Start Search, type “command prompt” and right-click on Command Prompt from the search results, and then select the “Run as administrator” option.
• After opening Command Prompt, execute this command: netsh winsock reset

Note: If you are using IPv4, execute the “netsh int ipv4 reset” instead. On the other hand, if you are using IPv6, execute the “netsh int ipv6 reset”

• Now exit Command Prompt and see if the error is now fixed.

Option 3 – Try running System File Checker or SFC scan

You could also run System File Checker or SFC scan to fix the BSOD error. It 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

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 PC.

Error Code 0x8007007B (Code 0x8007007B) – What is it?

Error code 0x8007007B (Code 0x8007007B) is an error that occurs when you attempt to activate Windows 10, as well as Windows Server 2008, Windows Vista, Windows 7, Windows 8, or Windows Server 2012.

Common symptoms include:

• You will see an error message like this: “Error 0x8007007B 'The filename, directory name, or volume label syntax is incorrect”.
• If you are using volume-licensed media to install: Windows 7, Windows 8, Windows Vista Business, Windows Vista Enterprise, Windows Server 2008 R2, Windows Server 2008, Windows Server 2012, Windows 10.
• Your computer is not connecting the activation wizard to a Key Management Service (KMS) host computer.

Solution

Further Information and Manual Repair

Error Code 0x8007007B usually occurs when a product key has been activated too many times. Blocking activation aids in avoiding abuse of the key. If abuse of the key is not the case, it is possible to get the key reset, or you may receive a new key altogether. When you are not sure that you can complete these methods yourself, as they do contain advanced steps, it would be wise to consult a computer repair technician to avoid making the problem any worse.

Generally, the solution can be simple; it is just dependent on how comfortable you are with getting technical in your computer. Volume licensed media means that the media has a preset number of times that it is allowed to be activated. This helps to avoid misuse of the product. Some people install the Windows 10 program multiple times on their computer if they are software developers or do certain types of software testing. It is important to know the cause in order to effectively find the solution.

Method One:

1. From the desktop screen, press the Windows key and S, type “Command Prompt”. Then, right-click on Command Prompt in the results. Select Run as Administrator.  Click Yes when asked about requesting permission.
2. In the Command Prompt box, enter the command: slmgr.vbs -ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx
3. The x's represent the product key. Replace these with your unique product key.
4. Type in the following command into the “Command Prompt” window: slmgr.vbs -ato
5. Click Enter
6. Restart your computer and try to activate windows again. It should not show the error code anymore.

Method Two:

1. While on the desktop, press the Windows key and R.
2. A window saying Run should open.
3. Type in the following command: Slui 3
4. Press ENTER and a window should appear.
5. This window asks for you to enter the operating system activation product key.
6. Enter this key in the space provided.
7. After entering this, click Activate.
8. Restart your computer now.
9. Check for activation. The Error code should be gone now.

Method Three:

1. Open the Command Prompt with access as administrator just as in Method One, and enter the following command: sfc /scannow
2. The command will complete the tasks. This will take some time so just let the computer do its thing and work. Let the sfc finish the scan.
3. When the scan is complete, restart the computer.
4. Check for the activation. The error code should be gone at this point.
5. If it is gone, revisit Method One or move on the Method Four.

Method Four:

Call the Microsoft Support Team and explain the problem in as much detail as you can give. Give the team the error code 0x8007007B and ask to have a different product key. When they give you the new product key, repeat Method 2. The Microsoft Support Team will either change your product key, or they will reset your current product key so that it can be used for activation again.

Error Code 0x8007000d - What is it?

Error Code 0x8007000d is a common error code that can be found on the Windows 10 Operating system, although it can also appear in previous versions of the operating system, as well.

Common symptoms include:

• Inability to download new updates.
• Inability to run the Update tool through to completion.

There are four basic ways to try to resolve Error Code 0x8007000d on your Windows machine. Three of these are pretty simple for even the most basic users, while the final method requires some familiarity with running commands in the Command Prompt. If you don’t feel that you have the skill or confidence to complete the steps listed below, it is generally recommended that you get in touch with a qualified computer repair technician that can assist you in error resolution.

Error Causes

The main cause for the appearance of Error Code 0x8007000d on a Windows machine is that one of the files that the Update tool uses to run one or more updates cannot be found or has experienced damage. Fortunately, there are a few things that you can try on your machine that can be used to attempt to resolve the issues at hand.

Further Information and Manual Repair

Three primary methods exist for the resolution of Error Code 0x8007000d on a Windows machine. As mentioned above, two of these methods can usually be accomplished by basic users, while the third requires some degree of familiarity with the tools associated with the Command Prompt. If you don’t feel that you have the knowledge or skill necessary to follow these steps, contact a computer repair technician to aid you.

Here are the best ways to try to resolve Error Code 0x8007000d on your device:

Method One:  Use the Troubleshooting Tool from Windows Update

From the Windows Update tool, you can attempt to run a scan using the Windows Update Troubleshooter, which can try to identify the specific issue that is occurring and to fix it automatically.

Not only will this tool often fix the problem at hand, but it can also help you to avoid other errors that you may have encountered later on in the Update process. This tool should always be your starting point when you encounter an error as you attempt to download or install updates for your Windows machine.

After the tool has been run, restart your computer to apply any changes and then reopen the Update tool to reattempt installation.

Method Two:  Reset Your Computer

In some cases, the missing or corrupted files may be extensive enough that you need to restore your computer to an earlier point. If you create regular backups of your information or have a past version of the software that you can install, this can help you to resolve the issue. Otherwise, you may need to restore your device to its factory settings to resolve the error.

Always make sure to backup your important files and information before you perform a reset of your device, in order to ensure that you are able to return the computer to its original state when you have finished.

Method Three:  Use Command Line Tools to Resolve the Issue

One of the ways that you can try to resolve this particular error code is the use a DISM tool. This is accessed through the Command Prompt. In order to use this method, follow the steps below:

• Step One: Open up the search bar in the Start Menu and type in the words “Command Prompt,” selecting it and choosing to run it as an administrator.
• Step Two: Enter each of the commands below, hitting the “Enter” key when you finish each one:
  • exe /Online /Cleanup-image /Scanhealth
  • exe /Online /Clean-upimage /Restorehealth
  • Exit
• Step Three: Attempt to run the Update program again. In some cases, you may want to restart your computer before you attempt to run the Update tool again.

If you have not been able to resolve the error code using the steps above or if you are unsure of your ability to follow these steps on your own, get in touch with a trusted computer repair professional that is familiar with the Update process and the errors associated with it.

As you know, the Google Drive service is a Backup and Synchronization service provided by Google. It was launched way back in April 2012 which provides users with the options to synchronize, store and share files by uploading them to Google’s servers where they stay until they are deleted personally by the users and can be accessed anywhere using the Google Account that’s used to upload them. Recently, a lot of users reported that they were unable to connect to Google Drive from their Windows 10 computers. This kind of problem has been noticed in the middle of the upload process and can be seen at times after the app launches. If you also experience the same issue, then you’ve come to the right place as this post will guide you in fixing it. There are a lot of possible reasons why this kind of problem occurs. It could be that the app was not able to launch properly or the internet got disconnected when the app was about to launch. It is also possible that the Firewall has blocked the app from connecting to the internet or that the antivirus program is preventing the app from making contact with its database. Aside from that, it is possible that the account you are using on your computer is preventing Google Drive from connecting to the internet due to some configuration errors. Follow the suggestions provided below to fix the connection issue with Google Drive.

Option 1 – Configure the Firewall

As mentioned, the Windows Firewall might be blocking the app from contacting its database so, in this option, you have to allow Google Drive through the Firewall. To do so, follow these steps:

• In the Windows Start Search, type “firewall” and click on the “Allow an app or feature through Windows Firewall” option from the search results.
• After that, you will see a list of apps, and here, click on the “Change Settings” button.
• Next, scroll down and make sure to check both the “Public” and “Private” options for Google Drive.
• Now click on Ok to save the changes made and then try to launch Google Drive again.

Option 2 – Try to launch Google Drive again

Google Drive might have not launched properly that’s why it can’t connect to its servers so you can try to launch it again and see if it helps.

• Tap the Ctrl + Shift + Esc keys to open the Task Manager.
• Next, go to the Processes tab and click on the “View” option located at the top.
• After that, uncheck the “Group by Type” option and click on the “Google Drive Sync” from the list of processes.
• Then click on the “End Task” option and close the Task Manager.
• Launch Google Drive again and see if the issue is now resolved.

Option 3 – Temporarily disable third-party antivirus

Aside from Firewall, antivirus programs, especially the third party ones, are also known to block files applications the instant it detects a threat to the system. Thus, your antivirus program might be the reason why you can’t download anything on your Windows 10 computer. To fix this, you can try to disable the antivirus program on your computer in the meantime and then try to launch Google Drive again. Do not forget to enable them again as disabling them can leave your computer vulnerable to cyber threats.

Option 4 – Try to create a new account

There are times when a certain configuration for a user account might be blocking some elements of the Google Drive app. In such cases, you can try to create a new account to fix the problem.

• Click on the Windows key and then click on the icon for Settings.
• From there, click on the Accounts button and select the “Family & Other People” option from the left pane.
• Next, click the “Add someone else to this PC” option.
• After that, click on the “I don’t have this person’s sign-in information” option and select the “Add a user without a Microsoft Account” setting.
• Type in the credentials for the new account you are creating and click on Next.
• After the account is created, click on the account and then select the “Change account type” option.
• Click on the drop-down menu and select the “Administrator” option and then click on OK.
• Now sign out of the current account and sign in to the new one and then open Google Drive again.

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.