I remember on bold-fortune.com ,this one guy was able to strip thousands of files from XP that were never used.They just sat in the background doing nothing,never to be used.I think he got xp down to a few HUNDRED files! He did get rid of a lot of files for internet use though. I thought maybe some program that marks each file somehow,then waits maybe a few months and marks the ones never used.After that time has passed,they get deleted.I'm sure the comp would run quite a bit faster!