This how to may help,
How to move DHCP databaseHow to move a DHCP database from a computer that is running Windows NT Server 4.0, Windows 2000, or Windows Server 2003 to a computer that is running ...
http://www.howtonetworking.com/articles/movedhcp.htm
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
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"Ben" <(E-Mail Removed)> wrote in message news

BEACAEB-1A64-4CE4-BBF3-(E-Mail Removed)...
I am in the process of removing my last 2000 DC which is the sole DHCP server
of my network. I have tried to configure a DHCP server on my new 2003 DC but
i have yet to be able to get an address from it. Is there something that i
am missing in order to get the new one working so i can remove the old one.
Yes i have deactivated the old scope so it would not send out any addresses,
i then release renewed my adapter and got an error message saying it was
unable to contact the dhcp server.
Thanks.
Ben