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, and despite rumors to the contrary, Windows 7 will have a registry.

HowStuffWorks “How to Clean Your Computer’s Registry”

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