Registry cleaners can either be heaven sent or come directly from hell to make your life a misery. The reason for this is that a registry cleaner tinkers with a vital part of the computer, not suprisingly called the registry. This is essentially the central nervous system of the entire pc and one wrong move can send your machine either crashing or create so many errors that it is unusable. The right corrections do the opposite, they make your machine cleaner and faster and a pleasure to use. For this reason it is advisable to do a little research before buying your software and the best place to look is on registry cleaner reviews. Look at all the pros and cons before you decide to buy.