Active Directory

I have a 2 pc network setup at home, I want to put in a 3rd pc. I have a Win2k Server (multi honed) running RRAS and NAT and a cable modem for internet access. With this setup my client pc running Win2k Pro can access the internet. I want to setup the 3rd pc using RIS. I setup active directory and kept everything pretty much at the defaults and created a domain name for my network. My problem is, now that active directory is setup, my client pc can no longer access the internet. I joined the client pc to the domain and have tried everything i can think of to fix this. I had to un-install AD to get my client pc back on the www. Can anyone help me on this issue? All answers will be greatly appreciated.

Thanx,

Tedd