I have been running Norton 2004, and having no problems at all. My subscription expires in a couple of days, and I was thinking about upgrading to NAV 2006 UNTIL I read a handful of reviews. Geez, I just want some simple to use, relatively cheap AV software that won't be a huge memory hog. I would appreciate suggestions. Oh, and if it matters, my machine is a Dell Dimension XPS Pentium 4, 3.0 GHz with 1.0 GB Ram. Platform is XP Pro 2002, service pack 2.