I had two Win 2003 domain controllers. Long story short, I recently had to reinstall the OS on one of them. Since I reinstalled the OS, whenever I try to re-add the server back to the domain, I receive an error stating that the domain controller already exists in Active Directory. Same results when I run dcpromo on it. I tried to delete it out of Active Directory so I could re-add it but I only receive the message stating that I need to run dcpromo to demote the domain controller before I can delete it. I obviously cannot run dcpromo on it to demote it since it isnt a domain controller anymore. I know I could just make up a new name for it but then I still have an extra domain controller in AD that doesnt exist.