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.