http://fileforum.betanews.com/detail/Eusing_Free_Registry_Cleaner/1144217010/1
i haven't tried eusing, so i have no personal experience. but reading the reviews makes me think ya gotta look at some ads, or they're trying to make you buy something.
it greatly behooves everyone to get in the habit of regularly cleaning the registry (particularly if you experiment with software as much as i do). your pc will run like a smokin' new pc/xt w/64mb memory!