it may just be that the wireless software on your laptop or needs updating. If you were so far away i would offer to drop in and and take a look at it for you as i have become rather good and getting the god knows how many laptops im my household to work with the worst router ever (not sure if i should say which one but the ISP was voted Worst ISP for 2007)
Also, now that you have said its the laptops built in wireless wont connect, you can rule out it being and issue with the router (very rarely that it is anyway) (NOTE: just so other people know, to get on the routers setup page its will be either
http://192.168.0.1 or
http://192.168.1.1 and, with nearly all routers, the DEFAULT U/N and P/W will be admin for both)
Could i trouble for a little more info on what the wireless software is? be it windows own or something like Intel PROSet/Wireless, i might be able to assist in a solution or possible updates