Windows2000 Autoconfiguration is enabled for network card

I am trying to connect a comcast modem cable to my pc. The comcast equipment is working but it can't get the ip #'s from comcast because of the 'autoconnection.' is enabled.

I've tried to disable it by using ipconfig/release' but I get the following message: All adapters bound to dhcp do not have dhcp addresses. the addresses were automatically configured and can not be released.

I've also updated the network drivers, replace the network card with a different brand. Uninstalled & reinstalled the network card. Nothing is working.
I have a Dell Windows2000 Pro Pc.

Help me.