Follow-up on router: Is your router in some inaccessible place? If it's near a computer, you should be able to take the modem-router cable and plug it into your PC. If the router is near the modem, you should be able to take the PC-router cable and plug it into the modem.
Testing another PC: Do you have another computer that uses the same router? If so, can you access the site from there?
Tracert: From a command prompt, how far out do you get when you run: