Here at the Chad’s News network command center, we use Avast! as our anti-virus program, because it’s free and is more or less mandated by our corporate masters for VPN access. The folks at Avast rolled out an update yesterday, at about 5:15pm Mountain Time, and it had severe problems. The update caused many false positives and crippled the programs that it incorrectly flagged as having the “Win32:Delf-MZG” virus. At 10:50pm Mountain Time, they released an update that fixed the problem.
If you are experiencing this issue, first update Avast! If you saved the corrupted files to “the chest,” you can safely restore them, and that will be that. Here at Chad’s News, however, we were caught by surprise and spent about 8-9 hours “fixing” the problem before finding out that it was all a mistake. Sigh… The linked article contains the official explanation and solution.