Try running regedit in Safe mode.

(Easy way to get to safe mode - Start>Run type in msconfig - On the Boot tab, mark the safe boot box under Boot options and restart. You'll have to go back to msconfig to clear safe boot, then reboot a 2nd time, after you try to make the changes to the Registry)

I don't know if this will make any difference but it's what I would try next if I personally had this problem.

Jim.