ethernet trouble

So, me and my brother in law want to play Dark Crusade over LAN, only trouble is when we connect the computers together, our ethernet modems still say they're unplugged.
I can connect my laptop (vista) to my g/f's laptop (XP), and by brother in laws computer (XP) to my g/f's laptop, no probs, but when i try to connect my laptop to his computer - nothing! 
any suggestions? thanks

>ethernet modems
I stopped reading right there.

Read up on:
-Computer networks
-Modems
-Ethernet
-TCP/IP

When (if) you have basic knowledge about that, come back and we might be able to help you.

I stopped reading at "(vista)" myself. If you're going to invite problems, you don't deserve help.

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