I used the versions 2008, 2009 and now 2010. For users of all Windows versions, this utility and convenient for you and corrects any errors that as and able to use the computer do not fail to accumulate. Everything is not perfect but the investissemnt in this software is not great and this purchase will avoid you taking your head with registry problems, it avoids slowing the PC start managing implementation need or not run at startup. Good investment; very useful.