The regedit command will open up the Windows Registry.
The Windows Registry is a master database with a hierarchical structure that is used by most everything on the computer system. The Windows Registry can store and make changes to the kernel, device drivers, services, Security Account Manager (SAM), User interface, applications, etc.
Backup your registry before making changes to it. To make a back up of the Registry, open up the Registry and click on File > Export…
To restore a Registry back up, simply open up the registry file and Windows will prompt you if you’d like to continue.
