The registry is where your computer stores information about the configuration of your system and your programs so that the operating system (Windows) can use it.
The registry is structured as "keys" and each key relates to a program or setting on your system. Windows reads the keys and uses the information to launch and run programs.
In order to prevent the complete reinstallation of Windows (and consequent loss of all information on your system) it is very helpful to have a backup copy of your registry available. The backup copy of the registry can then be used to restore any missing or damaged keys.
Defragmenting a system or registry is when the system removes blank bytes of data and consolidates the remaining information so that there are no blank memory pieces within it.
- Windows XP, Vista, Windows 7
- 256 MB RAM
- 10 MB free Hard disk space