I've never used a Registry Cleaner before, but if it can get rid of the Blue Screens of Death on my Vista PC, I'll buy one ASAP. Do they work? If so do they only make regular computing faster or do they fix errors like BSODs. I downloaded WinASO Registry Optimizer and it found over 400 "errors". Could these be responsible for my regular Blue Screens? The Blue Screens were gone for months and only started again last week.