Ok. Active directory does not have the concept of PDC/BDC, all domain
controllers are created equal, from which some of them hold some specific
roles (called FSMO). Except if you have NT4 BDC in your domain. Now if both
DC's are Windows 2000, then you can demote one of them by running dcpromo
again. Make sure, that you have at least another DNS server on your network,
as name resolution must continue to function. If you describe your domain
configuration more in detail, then I could provide more information.
--
Regards
Matjaz Ladava, MCSE, MCSA, MVP
Microsoft MVP - Active Directory
(e-mail address removed), (e-mail address removed)
http://ladava.com