Whenever I try to run any Administrative tool or some, but not all, programs, I get a message box that says, "Class not Registered". Generally, most of Windows 7 appears to work, but System Restore is broken, can't make a Restore Point, Administrative Tools doesn't work, and a couple of programs that have been flawless in the past. Does anyone have any ideas about this or is Windows 7 clean install the only solution?