My control panel stopped working aswell. I guess it happened after installing the ATI radeon drivers. Removing them didn't help. Searched in many forums about this problem and there seems to be an exact fix for my problem (which is - disappearing CP when trying to open it, can't open some games, My Computer properties won't open etc.). All the things that don't open are named in Microsoft's article which later redirects to a link, telling to download hotfix "KB929637 - Error message during Windows Vista startup if the Nero InCD program is installed and if the "Special pool" feature is enabled in the Driver Verifier utility: "Stop 00000050". That should solve my problem, the the thing is - Microsoft has to send me the link to this fix and I have to wait.... dunno how many. Found this hotfix here, but it doesn't open as it says that the update doesn't apply to my system, tho I downloaded the x64 version and my Vista is Ultimate x64. Why doesn't it apply to my system? Can it be because it is "v2" and there were some changes from the v1? Maybe the problem is because I installed sp1 earlier?