I was looking through my WINDOWS folder of my computer running XP, and I noticed this folder called prefetch. It has files in there that have as part of their names, names of software that I've already removed. For example I used to use Spyblocker, and in the folder is a file named SPYBLOCK.EXE-3B62345SA.pf. Is this prefetch folder something that I should worry about? If so what can I do about it. If the files in that folder are not important, then should I delete them? Thanks for any help.