|" I then connect to it from my room with a 54mbs wireless card and am trying to share this across an Ethernet switch to another Windows XP computer."|
Doesn't make much sense. I suspect you mean you have a XP box that has wired and wireless nics. Wired goes to the switch and extra pc. Wireless connects you to the router and internet.
If so, google or use help and support off the start menu to lookup Internet Connection sharing. The how-to will walk you thru bridging the wireless and wired nics in the intermediate machine.
Give a person a fish, they eat for a day. Suggest they internet search and they learn a skill for a lifetime.