I have read your tutoral "How to Speed up the performance of Vista". Item 33 "Clear the Vista Temporary Files" lead me to believe that I could delete them all without any bad effect. Is this true? In trying to get more speed I have ran CCleaner & Disk Cleanup. I cleared sent mail, trash, and browsing history. I also deleted all restore points except the last one. I checked the tempory files and the oldest one was dated 6-12, but I have 98 left. This must take a lot of space. Can I delete all of the tempory files? Thank you Bob