System Mechanic 6/7 problems (Win.XP Pro fully updated) I have used both version 6 and 7. While Sys.Mech. can speed up your system if used carefully. Important, in my experience, NEVER use Total Care and be careful with cleanup. Any time I used it in version 6 and 7, all sort of problems showed up. The most annoying one was that it de-activated any software needing activation I had installed - Photoshop CS2, Norton I.S. and MicrosoftOffice etc. Passwords were cleaned out. Luckily I had kept a list!