enable registry editor with group policy editor

1. Click on Start. Go to Run. Users running Windows 7 or Vista, go to Search.
2. Type gpedit.msc and press Enter.
3. Navigate to User Configuration/ Administrative Templates / System.
4. In the work area, double click on "Prevent Access to registry editing tools".
5. In the popup window, encircle Disable and click on OK.
6. Normally, Registry Editor will be immediately accessible. If it is not, restart your PC.

Getting access to Registry Editing