The Windows registry is a directory which stores
settings and options. It contains information and
settings for all the hardware, operating system
software, most non-operating system software, users,
preferences of the PC, etc. Whenever a user makes
changes to Control Panel settings, file associations,
system policies, or installed software, the changes are
reflected and stored in the registry. The registry also
provides a window into the operation of the kernel,
exposing runtime information such as performance
counters and currently active hardware.
Installing/uninstalling/changing software, hardware and
drivers never leaves a PC clean. Use NT Registry
Analyzer to find and remove incorrect or obsolete
information in the registry.

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