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If this does not work, are you able to connect to the modem direct so we can see if the network cards are ok ?
Taking the router out of the equation. Unplug the modem's power and then plug an ethernet cable directly from the modem to your computer and then plug the power for the modem back in. Wait about 30 seconds for it to initialize, and then go to START-->RUN and type ipconfig /release, Enter, and then type ipconfig /renew followed by Enter. Then type ipconfig and see if you get real information for the IP, Subnet and Default Gateway. DO NOT post the IP address on here, is that what is shown will be your actual IP (not like the 192.168.x.x you got before when the router was in the equation) and you don't want that information floating around the Internet