There is some urban lore about the Prefetch data that I can't vet. You can type What is XP Prefetch Data? on google to find out what it is.
-> YOUR CHOICE on this. I found no gain on hundreds of machines by doing this.
I have windows Xp(sp3) and tuneup utilities 2009 installed. When I use TuneUp there is a recommendation "Prefetech Data Deleted". But there is no option to correct. What is Prefetech data and I have never knowingly deleted it.