Originally posted by: nerp
If you just want the funcationaly of an occasional "scanner," check out Microsoft's Live OneCare saftey scanner. It's free and includes other things like a registry cleaner, etc. I've used it a couple times to confirm I continue to manage to avoid getting viruses and trojans and was pleased with it. Overall not a bad option for a scanner to use if you don't want to run resident software or need another option.
I can imagine it being handy in a situation where you're at someone else's house and they have no decent scanner installed and you need a scanner to troubleshoot.
http://onecare.live.com/site/en-us/center/whatsnew.htm <--- it requires an activex control.