The Windows Registry is undoubtedly one of the most complex parts of the modern computer. It holds all the information for program settings from program applications on your computer. Often times, after a long period of time has passed from owning your computer, files build up in the registry that take up space and cause the registry and your computer in general to run very slow. The basic fix for this is to have a registry repair done through a registry cleaning software that will fix broken files and delete corrupt and unused ones. Generally speaking, the smaller the registry listing, the faster your computer will run.