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Which router model? Which port is the cable modem plugged into? Which ports are the computers using? (many have ports 1-4 plus an uplink port, plus wireless)
Are you using static addressing or DHCP? Have you checked to make sure each system is using a unique IP address? (Start->Run...-> type "cmd", then type "ipconfig")
During router setup, did you enable a DMZ? Any other customizations or restrictions you can remember?
Have you tried anything to correct the problem like resetting the router, etc?
Which Norton are you using? Just antivirus or...? Norton Internet security has its own firewall. You would not want both Internet Security and ZoneAlarm installed or they'd fight for control. XP's Firewall is fairly useless but the other products know how to work around it.
Just a couple thoughts. There isn't enough yet to explain the problem.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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