A crucial part of your Windows operating system, Windows Registry is the component that governs the operation of Windows. Without a clean and well-organized registry, your Windows system is vulnerable to corruption, freezing, and crashing.
The registry contains information and settings for all the hardware, software, users, and preferences of your computer. Whenever you make a change to the Control Panel settings, file associations, system policies, or installed software, the changes are reflected and stored in the registry.
The operating system continually references this information during its operation. When the registry becomes very large, your computer's performance can decrease and cause it to be unstable.