removing domain controller from windows 2003?

I've got a dell server with windows 2003 on it that's been set up with domain controller settings.

I'm having a very unpleasant time installing Oracle 10g onto it and from what I've been reading, it appears to have something to do with the domain controller part.

I just need it running on a 5 computer network, completely unattached from the internet or any other computers.

So I suspect I don't really need the fancy domain controller settings.

Is there an easy way to turn it off?

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