You may also see the following error while launching Registry Editor Registry Editing has been disabled by your administrator

If your system is in a Network, you may need to contact the Network Administrator to relax this restriction (if needed). For standalone PCs, try the following and remove the registry editing restrictions:

1. Click Start, Run and type this command exactly as given below: (better – Copy and paste)

Now, you should be able to launch TweakUI, as well as the Registry Editor.

Using the Group Policy Editor – For Windows XP Professional

DisableRegistryTools value corresponds to the Disable registry editing tools Group Policy

User Configuration \ Administrative Templates \ System

Click Start, Run and type GPEDIT.MSC to launch the Group Policy Editor, and set the policy to Not Configured