In this Screencast, we will demonstrate how to recover Active Directory from a crashed Domain Controller or an unsuccessful DC demote procedure.
The below Step-by-Step video tutorial outlines the troubleshooting steps that are necessary to perform, both on Windows Server 2003 SP1 and on Small Business Server 2003 SP1 or later.

Step 1 In this step, we perform an overview of the enhancements of NTDSUtil, introduced with SP1 for Windows Server 2003.

Step 2 We use NTDSUtil and run the Metadata Cleanup command. We also address some of the Single Domain (SBS) problems which you might encounter.

Step 3 We clean DNS zones and review the results