|Looks ok, try and ping the router with the laptop that doesn't work, so,|
Then go into the router settings, http://192.168.1.1
and disable WEP, save the router settings then connect to the signal in wireless connections and see if that helps, also make sure that MAC address filtering is NOT on in the router, maybe it is only allowing the "good" laptop to "pass through". Remeber if disabling WEP works you will have to enable it again at some point.
Finally if you have an ethernet cable handy and a LAN port on the router, connect the cable to port and wait a minute of so and see if you can get online.