How do you connect your xbox 360 through your laptop with vista?

I tried to use a network cable to connect to xbox live with my laptop that uses vista. It didn't work, but when I tried it with my dad's laptop that uses XP it had no problem connecting. I used the same steps with both laptops to allow other network connections use the laptops connection. Could someone tell me why this happened and how I can make it work on vista.How do you connect your xbox 360 through your laptop with vista?
Set up Internet Connection Sharing on the Vista box.