An update for the AVG 8 antivirus software for Windows 2000, XP and Vista released Saturday mistakenly warned that the Windows system file user32.dll was a Trojan horse. The problem affected the Dutch, French, Italian, Portuguese and Spanish versions.
AVG Technologies immediately corrected the problem for both free and paid versions of its software. If users acted on the update's warning, the user32.dll file was deleted, leaving Windows XP systems endlessly rebooting or unable to reboot.
The Czech-based AVG posted details of the problem and a method to fix it on the AVG Web site. The fix involves disabling AVG services and copying the user32.dll file from the Windows installation CD -- but only if the PC was not rebooted.
The effect on Windows Vista systems, if any, was not clear.
A company representative said, "AVG is actively working to remedy the problem some users are experiencing related to the most recent update to commercial and free versions of AVG 7.5 and AVG 8.0 in some languages. A number of users who installed the update mistakenly received a warning that the Windows system file user32.dll product version 5.1.2600.3099 was infected with a Trojan virus and were prompted to delete a file essential to the operation of Windows XP."
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