After 2.5 years, my Dell XPS has become too slow. I use all of the spyware (Ewido, AdAware, and Spybot) and virus apps. (E Trust Internet Security Sutie) and have never had a virus. I use CleanUp! and WindowWasher and Registy Mechanic to no avail. I think the registry has simply gotten too huge. It is time to do a clean install of XP Pro.