Just don't mess with a server when you're not feeling focused, because you can end up something like i did:
I have a server (WS2003 R2) which acts as backup server (backup exec 2010). We needed a domain for Cluster services, so we decided to try with this server as DC. After promoting, the local accounts became domain accounts. Then, we changed our mind and in a hothead move, we demoted the server.
Then i saw i had lost all local accounts, and i tried to recreated them. Now, i'm not able to start the services (the dependency service or group failed to start) and i don't even know which account was used as log on service... (i've tried with all the old ones, but none works).
Anyways of getting the user back (i dont see anything in the registry, nor folders, but there is a few unknown accounts), or the backup exec settings?
Thanks...