System configuration information is stored centrally in a hierarchical database called the registry. The registry is a system-defined database in which applications and system components store and retrieve configuration data. The data stored in the registry varies according to the version of Microsoft Windows. Applications use the registry API to retrieve, modify, or delete registry data.
You can use Registry Editor to add and edit registry keys and values, restore the registry from a backup or to default values, and to import or export keys for reference or backup.
This tutorial will show you to reset to default the open position, size, last key, and layout view of the Registry Editor window for your account in Windows 7, Windows 8, and Windows 10.