Have you tried to do it manually?
Press the Win key + R , type in or paste in regedit,
Scroll down to what you want to remove and try removing it - right click whatever you want to remove.
A word to the wise - backing up the registry before editing is always a good idea.
I have run regedit
I have searched for the key I need to delete
I have attempted to delete the line I want to delete
A prompt came up unable to delete.