Things for you to look at:
0) To configure, best is only your pc connected to router. Pull out other pc cable connected to that router.
1) your cat5 cable, where it should go. From nic, it should go to num 1...4, from dsl/cable should go to wan. Try using different cable.
2) led on your router(link/act), if well connected from nic and router the led should turn green or continous lit.
3) nic, is it detected, the light is on. See at the back of nic.
4) check your browser not to use proxy. Clear all cache. Never dial a connection is set if you use IE.
5) The default ip is : 192.168.1.1 unless been changed by someone. If changed or you don't know, you can reset it to default factory. There should be a reset button. Sometimes you need to switch off and on after you did this.