I am sure it is a false positive, but just as an FYI; McAfee is reporting that a virus called "Artemis" http://vil.nai.com/vil/content/v_219587.htm is in Blender.
I scanned the file when I first installed it, and McAfee didn't find anything, but recently I was doing a routine scan of my flash drive as I was on a untrusted PC, and this came up for Blender.
It looks like the post 9/3/09 DAT files starting picking it up.
Sorry, forgot to add that I tested it by downloading Blender, along with using another flash drive I have Portableapps stored on, and it came up with the same thing, so my drive wasn't infected by this PC.