I have a version of 7 Ultimate I would like to make a legitimate "professional" version, since I have a valid Professional Key. Do they experts here think it would work to do the following: 1) in the registry go to local_machine -> software -> microsoft -> windows nt -> currentversion. Replace "Ultimate" in EditionID and ProductName with "Home Premium" 2) run WAU and use the Professional key. Will this work ok, or cause problems. Thanks