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. NT Registry Tweaker _ free tool to manage your Windows registry. Speed up your system and Internet, tune Explorer, apply security policy. It is simply and useful... and no more:) Vista supported. Enjoy!