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From your windows XP machine, try doing this junk. It'll help narrow down where the problem lies.
First try to dns. Go to a cmd prompt and try "ping <some obscure website you saw on tv you haven't been to>" It needs to be a site you haven't been to, so it doesn't just pull it from your dns cache. We want it to try to pull the DNS from the net. Check to make sure your dns servers are pointing to the right places in your network configuration on each XP machine.
Secondly, try traceroute.
tracert <anywhere>. That'll tell you if your connection to the outside is slow, and if so, where. You can also do this from the linux box, your results beyond your network should be similar.
Thrice, check your routes. Make sure your default gateway is set as the linux box.
G'luck.
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