I have run into a problem quite similar to this. The NetGear instructions should technically work, but do not because of the way that most ISPs hand out IPs.
I would suggest unplugging everything from both the modem and the router, including power. Wait for about a minute, then power up the modem. Once that goes through it's cylce test, plug the Internet into the modem and make sure the corresponding light is on.
Plug the router's ethernet jack for the Internet and connect it to the modem, then power on the router. Once completed, connect your PC via ethernet cable and power on your machine. Test that out.
I had to do this and it all deals with how Comcast has their IP/modem registration working. Only their equipment could get registered and only one piece of equipment per account can get registered. Sure, you can register other of their equipment, but they will charge you double for having two IPs.
Edited by Myke (11/19/07 10:03 PM)
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I swear, troubleshooting is a science: the best discoveries are always on accident...