Windows 2000 - Automatic SSL Certificate assignment

Hi

I have a client who is trying to install a SSL certificate (Verisign) onto a Domain Controller.  He already has an self signed certificate installed on the DC.  IF he deletes the self signed certificate and rebots his server, the certifiicate reappears.  If he deletes the self signed cert, installs the Verisign cert and sets it to perform server authentication, then reboots the DC, the self signed cert reappears and is set to perform server authentication - overriding the Verisign cert.

I don't have access to the servers and have been given little information but I am assured that the environment consists of Windows 2000 DC servers only.  Can someone give me any ideas on how to disable this SSL certificate auto enrollment for that DC?

thanks