Xbox live over ethernet crossover connection not working, help please?

Okay I followed every step every little detail on the ehow page how to setup a connection to xbox live through an ethernet cable running out of a computer connected to wifi, basically it goes to connect to the internet but does not connect everything is the same as the page says and no i'm not dumb about computers I build and fix my own all the time and done some side work I just don't have much skill in networking...

Okay for some reason I see a response on the main page but I can not see the post I can only see my OP

I got it fixed I did the same thing that the guy said to do but it seems my onboard nic port wouldn't relay outgoing internet signals, I installed a PCI nic card I found a week ago thrown in the garbage of my community laundry room looks brand new btw, and BOOM! it works, thats some odd computer hardware.