When to Use the Last Known Good Configuration

Situation SolutionAfter a new device driver is installed, Windows XP Professional restarts, but the system stops responding.Use the Last Known Good configuration option to start Windows XP Professional because the Last Known Good configuration does not contain any reference to the new (possibly faulty) driver.You accidentally disable a critical device driver (such as the Scsi port driver).Some critical drivers are written to keep users from making the mistake of disabling them. With these drivers, the system automatically reverts to the Last Known Good control set if a user disables the driver. If the driver does not automatically cause the system to revert to the Last Known Good control set, you must manually select the Last Known Good Configuration option.