Problems with router

Hi, I’ve been having this weird problem and I’m wondering if you can help me out. Whenever my laptop is directly connected to the cable modem, the internet is fine and there’s no problem. However whenever I try to connect from my router, my computer doesn’t even recognize that there’s a connection and states that the network cable is unplugged. I’ve tried reseting the router and cable modem, but no luck. When I try connecting via router to another computer, there is no problem and everything runs fine.

I’m running Windows XP Home with 1 gig of ram.