Last Known Good Recovery

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The Last Known Good configuration provides a method for recovering to your preceding system setup. When you create a specific configuration for Windows NT, that information is stored in a particular control set. The LastKnownGood control set enables you to recover from a boot process error—provided that you use this method immediately after discovering the error on the first boot up attempt and do not log on a second time. Subsequent boots (if they proceed and you log on to the system again) remove this option as a recovery method.

The information contained in the LastKnownGood configuration is stored in the Registry in the HKEY_LOCAL_MACHINE\ SYSTEM\CurrentControlSet key.

To boot to the Last Known Good configuration, follow these steps:

1.	Reboot your system.
2.	Press the spacebar when a message appears asking you whether you want to boot the Last Known Good configuration.
3.	When the Hardware Profile/Configuration Recovery menu appears, select a hardware profile and press the L key for the Last Known Good configuration.

In instances where a critical system error was encountered, Windows NT Workstation defaults to the Last Known Good configuration on its own accord. This doesn’t always occur, but is a frequent occurrence. Should basic operating system files be damaged, you must boot up using a boot floppy and recover your system as described in the next few sections.