You could try unlocking the registry with this reg file:
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System] If its set to 1 change it to 0 as seen here. "DisableRegistryTools"=dword:00000000
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System] If its set to 1 change it to 0 as seen here. "DisableRegistryTools"=dword:00000000