A registry cleaner is an extremely useful program to have installed on any computer. Registry Clean Master is one such solution that can help you to keep your computer running smoothly and well maintained. Since the system registry is full of important system settings and program configurations as well as other important data, it is essential that it is kept running up to scratch at all times. Over time, the registry can get bogged down with unused keys and it can also become fragmented. When this is the case, your computer's overall performance and reliability will drop and in some cases, certain programs may refuse to even start up at all.