Sounds like someone else found that Avast is pretty decent.
http://www.wilderssecurity.com/showthread.php?t=36340
I’ve been looking for a new firewall and figured I’d give avast! a whirl. I installed it and right away it found a virus. I deleted the file and didn’t really think much of it. Then I gave a quick random scan of a complete folder and was shocked. It bfound over thirty instances of Win32:Hantaner in trusted files including the installation files of MRUblaster, process gaurd free, and kerio personal firewall. How cna this be? I’ve never had trouble with a virus before. I ran a McAfee Virus scan on the same folder and it found nothing. Is this for real or a mistake?