I too cannot run regedit or cmd
Desktop goes blank for a second, then refreshes
Noticed that several programs that normally sit in system tray aren't starting, but can be manually started. This includes Norton Security.
I've run a boatload of registry cleaners and virus scanners - everything is clean
No policies are enabled
I found a 3rd party regeditor that works. Using that, I found nothing in the way of
DisableRegistryTools or DisableCMD
Previous post regarding this subject concluded reload the OS - not a good option