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Thanks again! I tried that; there is no firewall enabled on my Mac or Windows XP, but the IP address is of the form 10.XXX.XX.X....
Thank you for your suggestion! When both of those options are set, there is still no internet connection though..
I just activated my parallels version of Windows XP on my Mac....over the phone, because I can't access the internet in XP, even when I try...