Hi,

The domain that is asked on the installation, is a DNS domain, not windows 2000 domains... different things...
If you want to sucessful configure network support, your hostname must resolve, you must have a working name service that is able to resolve your machine hostname... if you don't have this situation, don't choose to configure the DNS ( choose "None" when asked ) at the installation process, do it later.
Ah, and if the DNS server is working but it's not on the same network as the machine you're trying to install it will fail too, because the installer doesn't ask for a gateway, so you'll not be able to reach other networks...

Good luck !