Using laptop to get xbox live

I recently had to refomat my laptop and I was using it for internet on my xbox 360, I know it is possible to do it this way as i used to use it like that forever, I just cant remember what you have to do in the network settins to make it work, I know i had to go in and open something i just cant remember, Can anyone tell me please its windows vista

wait....is that even posible??

is it only in windows vista?

yes its possible you use an ethernet cable its how i have been getting internet on my xbox since i got it, i just gotta do something in network and sharing i just cant remember cause i reformatted

here I think this might help...I was reading about it