As with any registry cleaner it really is USER BEWARE; especially if you are a novice and you're not exactly sure what you're deleting from the registry. Registry cleaners can render your machine in-operable, so always tread with caution and seek expert advice before deleting. The gains achieved by these cleaners is debatable. Whatever; just don't go deleting registrty entries willy-nilly because you might be very unhappy at the end of the clean. Do your homework before attempting to use any registry cleaner and, if so tempted, go for one that is not too aggressive in it's approach.