For you open source freaks out there who want (or need) to use Windows, stay virus free, but only use open source software (besides your OS), there is a new piece of antivirus software out there. ClamWin is a Windows port of the well-known ClamAV, released under the GPL, and it works very well. Besides your own use, it's also good to have a free/legal solution to those house calls where your friends/neighbors/family has a virus but doesn't want to buy AV software.
Check it out at the ClamWin website.
Re: Free (as in Freedom) Antivirus Software for Windows
Sweet! I've been looking for an open source anti-virus scanner for Windows for quite some time, and I think this is the first. Thanks for the link.