Network World : How Did My Protected PC Get Infected?

"SUPERAntiSpyware found three Trojans on Bill Artman's PC. Bill asked the Windows forum how this could happen when his PC is protected.

There's no such thing as perfect protection. Even if you have the best firewall and antivirus software available, and keep it up to date, something might get through. But knowing how they'll get through can help you block them." ~ Lincoln Spector, PC World

http://www.networkworld.com/news/2010/081610-how-did-my-protected-pc.html?source=nww_rss

Don't let this discourage you from trying to protect yourself. You need to understand that new viruses and holes in software are being found or created everyday. Your software can protect you, sometimes it just takes a bit of time to do so. Much like contraceptives, no anti-malware/virus product is 100% effective.