Security Administrator Street Smarts: A Real World Guide to CompTIA Security+™ Skills, Third Edition

Task 10.2: Implementing Last Known Good Configuration

Last Known Good Configuration (LKGC) is a bootup option from the Windows Advanced Options Menu. It rolls back the current Registry settings to the state of the Registry at the last successful logon. That successful logon represented a “known good” Registry. If the system booted and the logon service was functional enough to authenticate you, the configuration being used by the Registry must have been good. The LKGC has been a feature of Windows beginning with Windows NT and remains useful through Windows 7 and Windows Server 2008 R2.

There are times when the LKGC will correct the problem, and there are times when it will not. The LKGC only restores the Registry to its earlier state. It does ...