If you are planning to replace the server with a new one, then it is quite
simple:
1. Install new server and add it to the domain as additional DC trough
dcpromo
2. Transfer all services that your root DC held (DNS, DHCP, WINS,....)
3. Make your new server as global catalog (if the old one was one)
4. use netdom query fsmo to determine if your root DC is holding any FSMO
roles. If it does, then transfer them to new server
5. Use dcpromo to remove AD from that server
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Regards
Matjaz Ladava, MCSE, MCSA, MCT, MVP
Microsoft MVP - Active Directory
(e-mail address removed), (e-mail address removed)
http://ladava.com