Starting early in the morning the latest update for Avast has been tagging .exe files as a rather old trojan.

Of course the easiest thing to do is panic! Unfortunately in this case practically everything is being tagged with “Win32:Delf-MZG [Trj]“. This was brought to my attention when someone tried to run Rosetta Stone. After ignoring the first warning, this was brought up again when trying to run the updater for Rosetta Stone.

A quick search on the web found that multiple users are having trouble with this. The issues seem to stem from VPS version 091203-0 downloaded 12/03/2009. This VPS version is affecting at least the home version and the professional version.

There is an updated VPS version 091203-1 that has been released which will correct this issue. Please update your Avast by Right-clicking the “A” icon in your system tray, go to Update and select “iAVS Update” You should see a summary screen similar to this that indicates you are updated.

The official explanation from Avast for this can be read at:
http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=377