Registry editing has been disabled by your administrator

If you ever encountered above error, i.e. “Registry editing has been disabled by your administrator” on Windows XP or any other Windows NT Operating system, this may help you!
I have encountered the above error while patching registry. Even regedit command was not working!
Here is a simple solution which worked for me!
Click “Start >> Run” or press “[window key + R ]“ and type or paste following command exactly as given below. An hit ENTER.

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

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