Discussion on:

Where can I find NAT?

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> the spare computer I'm talking about isn't used for anything else
> than enabling internet for the XBOX... So I guess that turning the firewall off
> would not be so dangerous
WRONG! Wrong! Wrong! There are volumes of security exploits built around just the scenario you describe. You would be very vulnerable.
There are two firewalls on the Windows box that you need to adjust. One is the firewall on the wireless controller port and the other is the firewall on the ethernet port. On both firewalls, you want to open the following ports:
TCP 80
UDP 88
UDP 3074
TCP 3074
UDP 53
TCP 53