Have you tried to add the laptop through the router - login into the router goto wireless settings, setup access list then type in the MAC address of the laptop as a wireless station.
Make sure the SSID is typed in caps....
Also you may have to login to the router on the working laptop by typing in the url - 192.168.0.1 look in wireless devices and see if a new device is there to be added, if there is one add it. That should work.
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