I am currently running XP pro with SP2. This is the second time that it started to slow down when opening a folder, especially a folder from C drive. The first time it did this and no solution was found, I formatted and reloaded all my programs. This time I have ran all the virus scans and spybot, adware scans, disk check, defrag, and still no improvements. I notice that the pcu is showing 100% when the slowdown occurs. Does anyone have and idea what to do to improve PC performance.