Open up Notepad and paste everything below into it.
Code:
REGEDIT4
[HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Policies\System]
"DisableRegistryTools"=dword:00000000
Remove the spaces in 'current'
Save the file as
"fix.reg" (inclusive of the quotes)
Double-click on it & answer YES when prompted to merge into the Registry.
Can you now open the registry?