Based on my experience with LW and having to do a re-install it isn't necessary to alter / remove the reg keys. If you feel you need to, use a good reg cleaner -- there are several out there. Do the simplest things first. If you use a reg cleaner make sure you know what you are doing and make a restore point before cleaning. I've had clients really screw the pooch because they didn't set their parameters correctly. Even the best reg cleaners aren't exactly for the neophyte and some of the settings are difficult to understand if you don't know what the switch is specifically asking/telling.