Re Enable regedit, command console "cmd", task manager, system restore."
Re-Enable is a handy tool that will re enable registry editing after a Worm / trojan / malware / virus has disabled registry editing, this will also re enable Cmd / Taskmgr / System restore Config / Folder options config and Run command. you can free download Re-Enable 2.0 now.
tutorial:
Open it(run as admin if u vista/7)
and then check..the problem u got..=/(example my regedit got disable by admin,so i check the regedit)
and then click Re-enable