Funny I used to have a copy of Virex 7.2, I wonder if it auto-deleted... spooky.
There is ClamXav, which is a free/donationware open source anti-virus software to clean the windows filth off your files. 😀
http://www.clamxav.com/
Yea you don't want anything that installs itself as a part of your OS, a standalone app does the trick very nicely without clogging up the works and causing issues like magically disappearing emails for instance.