"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." a company representative said.
The Czech anti-virus company has posted a fix tool and further details on its website. For users who are unable to boot Windows after updating to the latest version, they have been told to, "contact their AVG reseller or ask a friend to download the information and fix tool for them." This latest problem comes after a recent update identified elements of the ZoneAlarm security software as a threat.