The Microsoft Computer Dictionary, Fifth Edition, defines the registry as: “A central hierarchical database used in Microsoft Windows 98, Windows CE, Windows NT,and Windows 2000 used to store information that is necessary to configure the system for one or more users, applications and hardware devices.” The registry is essential to the operation of your system. It holds an enormous amount of information to make your use of the PC easier and more enjoyable. Every time a change is made in the control panel, for example, or if you change your screen saver, this change is stored in the registry and loaded each time the computer is turned on.