Looked on CNET Downloads for reviews of registry tools, seemed like Advanced System Care free was well liked and had by far the most downloads, so tried it. PROBLEMS!! On attempting to restart to make the changes made by the program such as updating some drivers and cleaning up some things, Windows 7 wouldn't even start, Windows did some kind of repair that took quite a long time and then the program was gone. Any idea why all that happened? Is that AdvancedSystemCare free a legit and useful program? I don't mess with the registry myself but figure it likely could use some "cleanup". Looking for good advice, and info about that program Thanks!!