computer restarts when clicking on regedit

malware. Can you boot into Safe Mode? If so, scan with updated AV and spyware checkers, delete anything found and then rescan. You need the rescan to come up with nothing.

If you get this far, open the device properties for the C drive, click the Tools tab and then click the Error Checking button, check "Automatically fix file system errors", OK, then allow the pc to reboot.

If you can't even boot Safe Mode, the choice is to first slave the drive into a good pc and scan for the above; or, if no other pc is available, save all needed data and reinstall the operating system. You could do a repair install, but this option often does not rid the pc of all malware.

Let us know what happens.