Turning on my pc this morning, I found a virus before I can delete windows it stops my computer says there is a critical virus

I have a virus in my work pc I can't erase it because windows will close the computer down saying theres I a critical virus, it's a Trojan horse.

Hello

Who is the antivirus application installed on the computer?

Method 1: Start your computer in safe mode and try to remove the virus.

http://Windows.Microsoft.com/en-us/Windows-Vista/start-your-computer-in-safe-mode

Restart the computer in normal mode and check.

Methode2: Start your computer in safe mode with network and perform a full service scan using the Microsoft Safety Scanner and remove the virus if it is detected.

http://www.Microsoft.com/security/scanner/en-us/default.aspx 

Also scan virus with malware removal tool
http://www.Microsoft.com/security/PC-Security/Malware-removal.aspx

Method 3: Restore the system to perform on the previous date of work.

http://Windows.Microsoft.com/en-us/Windows-Vista/what-is-system-restore

NOTE: To uninstall the applications that are installed after the system restore point has been created.

See also:

How to stimulate your defence of malware and protect your PC
http://www.Microsoft.com/security/PC-security/protect-PC.aspx

I hope this helps.

Tags: Windows

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