Windows XP

My Media Center PC runs on Windows XP. Today I visited Microsoft updates site and found out I had a backlog of 41 high priority updates since January 2007. I simply never do the updates and I get away with it. I never even bothered to install an anti virus package, for performance and stability.
But then again, I don't get exposed to risks too often. My DSL router has a firewall. I only use the Media Center PC for running MediaPortal. It doesn't have e-mail or any office applications and I don't use the web browser on it.
Knock on wood...