From what I know about anti-virus programs, they scan for segments of 'malicous code', and they have to be told what that code is. For example, the anti-virus program works off of the massive database of known viruses and nothing else. My concern is that if someone was to create something new and completely original it would be unstoppable until one of the major anti-virus software updates found a fix for it and distrubute this. Is this the way things really work? Seems like there could be a way to prevent your computer from doing certain things (like a firewall or the "virus like activity" feature in Norton), other than the sytem resource hogging anti-virus programs. Sorry about the babbling.