To work around this issue you can run dcpromo with a command line option that will forcibly remove the server from the old domain and remove Active Directory.
First open up a command promt and run the following command:
dcpromo /forceremovalWhen it finishes you will need to restart the server. It should now be free from the original domain and Active Directory should no longer be installed.
As usual this may not be the only way to solve the issue but "It Fixed It for Me"
For more of my "It Fixed it for me" articles please click here.