The registry is a very important part of any Windows operating system, but the registry can also easily become corrupted, and there's no registry cleanup tool built in. So, you'll either have to perform the registry cleanup on your own, or obtain some software to do it. We will discuss the various methods available to you. Whenever you install a new program on your system, it adds an entry or entries to your computer registry, which makes the registry bigger. They also take up disk space. So the first thing you can do to perform a registry cleanup is uninstall the programs you aren't using anymore. Just go to Add or Remove Programs in your Control Panel, and you can get rid of programs pretty quickly and easily. As helpful as uninstalling products is, problems can still remain, since uninstall does not perform a complete registry cleanup. A number of corrupt registry files will remain, and your work will not be complete until you get rid of them. You can take their files off your system yourself, or you can use a registry cleanup program. To remove corrupt files yourself, go to C:Program Filesapplication_folder, and delete it. Registry editor also allows you to make your own changes to the registry. Run the "regedit.exe" file, but always backup the registry first. A professional registry cleaner is recommended, since manual registry cleanup is very tricky. Even the most seasoned computer users are scared to touch their PC registry. The whole manual registry cleanup process is very tedious.