[ZX5focused]

My friend just bought a router so that he can share his internet connection with his desktop, laptop and xbox. heres the problem, his dsl modem is built into his dell computer. the computer has the modem and a seperate network card. i spent 2 hours trying to play with settings to get it to work and couldn't get anything.
It's a dlink router. Ive accesed the router control site from the laptop and played with some settings in there to try and get to recongize the desktop but still no luck.

any advice?? i read on one site that i need to turn the desktop into a "switch", but i have no clue how to do that if it is even the right thing to do.

thanks guys.