[Patton]

If you have a cable modem on one computer, why do you have a dial-up in the other one? Take it out, and then try.

Make sure you know the IP address of the host computer. Once everything is loaded on the client-side, type 'connect <ip>' into the console, replacing <ip> with the host's IP address.

I'm assuming you actually have the two computers networked... as in NICs, a hub, CAT5 cable, etc. If not, look online for a simple guide to networking. You can hook up both PCs to the cable modem if you have a hub and 3 network cards. I'm too lazy to explain past that.