Sometimes you can not run Regedit. This is due to a setting in the registry itself.

When you try to run Regedit, you get a message like “Registry editing has been disabled by your administrator” or something similar.

To resolve this run the following command:

REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f

This should get you the instant result.