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Danger level 7

Critical System Failure 855 518-8366

Critical System Failure 855 518-8366 is a treat that shows a false warning claiming the Windows security has been compromised. The part every user should find suspicious is that the message provides only a telephone number and does not give any other options. If you call this number, the people pretending to be from the technical support could try to convince you there are serious issues with the system and trick you into purchasing unnecessary and expensive products. Clearly, this would be a waste of money as there is nothing wrong with the system. All you have to do is eliminate Critical System Failure 855 518-8366 false warning. For this reason, our specialists prepared a manual removal guide to get rid of the threat, which you can use if you slide below the article.

Critical System Failure 855 518-8366 may appear after installing suspicious software. As the research shows, it could be downloaded through bundled installers or redirections to malicious web pages. Thus, the appearance of the fake alert should warn you that the system might be vulnerable to threats. If you do not want anything like this to happen again, we would advise you to avoid suspicious websites and applications. Also, there might be other unreliable software on the computer, so it might be a good idea to clean the system. This you could do with a trustworthy security tool.

The application that shows Critical System Failure 855 518-8366 fake message should install itself by placing a file called winerr.exe in the c:\users\user\appdata\roaming\winerr directory and creating a Registry entry pointing to the same file. Because of this entry, the warning should open itself automatically each time you turn on or restart your computer. The false alert cannot be turned off even with the Task Manager because the application seems to be able to block it.

What’s more, as we said earlier the message claims that your operating system’s security has been compromised, although it does not specify what actually happened. Besides, it provides the mentioned telephone number (855 518-8366), computer's ID (code from eight numbers), and a line to enter a “Response Code.” Probably, the idea is that you have to get this Response Code while talking to the Technical Support.

Therefore, if you contact these scammers they might tell lies about your system, for example, they could claim the computer is infected with some malware and offer their remote services to remove it. Needless to say that such services could cost you some money. Moreover, they might also say that the computer was locked for security purposes because some hackers tried to steal your passwords or other sensitive data. In this case, Critical System Failure 855 518-8366 fake message’s creators could offer you to purchase expensive security tools or software alike. As you realize, there is no point in contacting such people, so the best you can do is eliminate the threat as soon as possible.

Since Critical System Failure 855 518-8366 false warning could block the Task Manager, the only way to unlock the screen and erase the applications is to restart the computer in Safe Mode. If you never had the chance to use the Safe Mode and do not know how to enable it, you should follow the instructions placed below. The first part of the steps will show you how to restart the system in Safe Mode, while the second part of them will list the files that need to be erased.

However, users who do not want to waste any time while locating and deleting data mentioned in the instructions manually could use an antimalware tool for this task. With such tool users could find other possible threats as well, so the software would allow to clean and secure the system at the same time. In any case, if you need any help with the deletion part or have a question about the application you would like to ask us, do not hesitate to contact us via social media or leave a message in the comments section.

Restart the system in Safe Mode with Networking

Windows 8 and Windows 10

  1. Press Windows Key+I.
  2. Click the Power button, then press and hold the Shift key as you click Restart.
  3. Choose Troubleshoot and pick Advanced Options.
  4. Select Startup Settings and click Restart.
  5. Press F5, then restart the system.

Windows XP/Windows Vista/Windows 7

  1. Navigate to Start, then mark Shutdown options and click Restart.
  2. Press and hold F8 as soon as your computer is restarting.
  3. Choose Safe Mode or Safe Mode with Networking from the Advanced Boot Options window.
  4. Press Enter and log on to the computer.

Eliminate Critical System Failure 855 518-8366

  1. Launch the File Explorer.
  2. Find a file named as card.exe (could be in the Desktop, Downloads, Temporary Files directories).
  3. Select card.exe, right-click it and mark Delete.
  4. Locate the following path: C:\Users\User\Appdata\Roaming
  5. Find a folder titled as Winerr and check if there is a file called winerr.exe inside of this folder.
  6. Right-click the folder and press Delete to erase it along with the data inside.
  7. Then tap Windows Key+R, type Regedit, and press Enter.
  8. Find this location: HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
  9. Look for a value name titled as Windows Authorization.
  10. Right-click the value name and press Delete.
  11. Empty the Recycle bin.
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