so does the router do NAT? It sounds like the Router isnt giving out IP addresses but in most cases Windows will give an 169.244.x.x if it can get an IP. A few things is check the properties of TCP/IP and make sure its set to automatic. CHeck the Network card is working under device manger. I asume your running wireless so try plugging the PC or laptop into a port in the router or AP.
I\'m not your Google Butler!