Go to Start, Programs, Administative Tools (Common), click Server Manager, click on your computer name, click menu item "Computer" click "Promote to Primary Domain Controller"
lennybratcher,
The only way to promote a server to a primary domain controller is if it was a Backup Domain Controller. To get a member server to be a domain controller, you must install it as one.
About two years ago I came across an application that claimed to be able to promote a machine without re-installing the OS. I believe the name was UPromote. I never used it, though.
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