The Windows Registry is an enormous batch of files containing information about almost everything that occurs on the computer, from a visit to a Web site to a program installation. The registry also contains information about drivers and other essential programs, like DLLs -- small helper programs that often work with more than one application. This information is stored in the form of "keys" that help programs run. It's like a big blueprint for where everything goes on your computer and how it all fits together. Only computers running Windows operating systems have registries