Your computer that can connect has nothing to do with the the one that cannot. You have a router, it doesn't go through the host computer at all.
From the wireless computer, go to hppt://192.168.1.1. Default log in for the router should be admin and password, but not positive. If you can get into it, the wireless is working, it's a different issue. If you cannot, go to the computer that is hardwired and go to the same address and log in to the router. Check the settings (do you have encryption on already, MAC address filtering, etc).
Also, have you run the network setup on the laptop in XP already?
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