I run an anti-virus and basic Firewall (no HIPS). Because I don't have HIPS, should I be worried about things being able to bypass the firewall? I found classical HIPS to be a burden to run and I only install stuff on my comp that I'm sure is safe. To help protect my comp, is there a free Trojan Scanner that I can download to my computer and run on-demand. Not a behavior based one, but one that just searches for known worms/trojans that are on the harddrive?