The Registry is a key component of the Windows operating system, so much so that without it Windows would not even run. When a new piece of hardware or software is installed in Windows, it stores its configuration into the Registry. This allows Windows to retrieve that information at later dates such as when it is starting up. As Windows starts it will read the configuration in the Registry and know what drivers need to be loaded, what settings to be applied, and what resources need to be allocated in order for the equipment to work. Because this information is stored in the Registry on the hard drive, Windows has this information available each time it boots up.

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