Open Notepad and type the following:
REGEDIT4
[HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrent
VersionPoliciesWinOldApp]
"Disabled"=dword:0
[HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrent
VersionPoliciesSystem]
"DisableRegistryTools"=dword:0
Save it as something.reg then run it. its that simple