I think it is a scam myself. Firsyt it will run a free scan and find all kind of problems mostly registry problems then you must purchase it to clear the problems.
I ran the scan. I then ran CC Cleaner and cleaned my system using the built in function of MS Windows 7. I than re-ran the the PC Matic scan again it found registry errors I knew were not the as I had cleaned my registry with CC Cleaner. The scan is built to show you have problems so you by the program