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AVG Virus Scanner Accidentally Removes Critical Windows Component

November 13th, 2008 Leave a comment Go to comments

DailyTech – Update: AVG Virus Scanner Accidentally Removes Critical Windows Component

The world of computer security can be a scary place for friends and foes alike.  This weekend users’ found their AVG software updated with a new virus definition file.  Then they quickly found their computers crashing.

What was discovered was that the new virus definition file mistook user32.dll, a critical Windows component, for a container for the Trojan Horses PSW.Banker4.APSA or Generic9TBN.  When the scanner went active, it deleted this critical file, thinking it contained a virus, causing the system to crash.  AVG recommended users whose definitions auto-updated delete their virus definition file and cancel any scans they have running.

If your computer is affected, it will either stop booting or go into an endless reboot loop.

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