When you stop using software - even when you uninstall it - its amazing how much junk is left. Using XP, you can go back to the set-up just before you install p2p. Then you'll have your system as if you'd never had p2p. However, a word of warning, no matter how fast your new machine is, its amazing how it soon appears to slow down. Its not - you're just getting used to the speed. Try going back to a slower PC - you'll soon find out.