Removing PDC from a NT 4.0 Server

As Microsoft states, NO, you cannot (have to reinstall)
There are some third-party tools, but I believe MS will not support you after you use them.

Dima,
Brainbench MVP for WinNT Admin,
http://www.brainbench.com

Demoting a PDC to BDC Status

If you need to demote a PDC manually and the preceding procedure won't work (possibly due to hardware or Registry-related failure), try the following approach to perform a PDC demotion:

Notify the users that the PDC will be shut down.
On the PDC, open the Control Panel and then the Services applet.
Stop the Server service. This prevents new user logons while the change is underway.
Open Server Manager.
Select Properties from the Users menu and click the Computer button.
Click the Disconnect All button to disconnect all users.
Select the PDC.
Select Demote To Backup Domain Controller from the Computer menu.
Restart the Server service on the former PDC.

You can ONLY demote a PDC to BDC (that's even in the presence of the BDC) but you can't demote to a regular server without
re-installing the PDC. Microsoft says and i've tried it myself. NO is th answer!

jIGGY1001 is a million percent right. I have tried to prove microsoft wrong on that one and could not. You will have to reinstall if you want it to be a member server. If it's a BDC then you could add it to the domain and do a domain syncronization.

Good luck.

I just had the same problem and i could not figure out any other way but reinstall you can how ever change it to a BDC.

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