If you are the administrator of the PC & the windows slaps you with the message that “Registry Editing is disabled by your Administrator” when you try to enter the registry editor, there may be possibility of a virus called W32/Brontok-Z which makes the changes in the registry editor.

All you have to do it open Group Policy & enable it from there.

Go to Start->run->type ‘gpedit.msc’ & navigate to User Configuration ->Administrative Template-> System

Here you can find “Prevent Access To Registry Editing Tools ” in the right pane, make sure its not Enabled. If its Enabled then you will be restricted from using Registry Editor, to change it double click it & select the option Disabled/Not Configured (Not Configured is the default & internally it means Disabled). This way you can re-enable the Registry Editor.

If the above trick doesn’t work, then you can use a freeware tool called RRT (Remove Restrictions Tool) from Majorgeeks.

The information about the tool is given there.