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24 Dec 2009  

Windows 7 Ultimate x64 SP1

To me this sounds like the issue is on the XP machine with the firewall on the desktop.
I would make sure that the game you are hosting on the desktop is allowed to go threw the firewall. You can test by disabling the firewall on the desk top and host a game and see if the Win 7 connects.

When hosting anygame 70% of the problem is a software firewall.
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