To repair problems in your Windows registry:
Registry Mechanic automatically creates a backup of the entries it changes in the Windows registry when the repair function is executed. These backups allow you to undo any of these changes, and can be accessed through the Restore registry backup screen. Note: This is not the same as creating a System Restore Point on Windows XP systems. If you have selected the "Create a System Restore Point before repair (XP)" option on the General options screen, Windows also creates a System Restore Point before implementing any changes to the registry.