Sharing a Wireless Connection

[jbk303]

I am connected to the internet like this:

Internet
|
V
Cable Modem
|
V
Wireless Router
|
V
My Computer

My Computer runs Windows XP and connects to the router wirelessly (they're on different floors.)

I have another computer that I want to connect to the internet; otherwise its useless to me. I cannot find a wireless card that will work on linux, nor do I want to set one up. Ethernet works fine, though.
I am not using the NIC on my first box and I want to connect the other one to the internet through the first one's wireless connection. I have tried several things, including but not limited to a proxy server, internet connection sharing, and network bridging, but I didnt know networking well enough to make them work.
Can you tell me what I can do to connect the useless box to the internet?

Thanks in advance,
Josh

[cszeto]

Running ICS against the wireless adapter on your XP machine should allow you to "share" it's Internet connection with the other machine via the available ethernet NIC.