How do I remove Active Directory (AD) if the demotion failed?

A. If the demotion failed when you removed AD from a Windows 2000 domain controller (DC) to convert the DC to a member server, try the following approach:

  1. Use regedt32 to navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ProductOptions.
  2. Change the ProductType's data value from LanmanNT to ServerNT. (Use the exact case.)
  3. Shut down and restart the server.
  4. Delete the NTDS folder.
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