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Send your laptop to us and we will diagnose the...
go to start->Run->
then type 'cmd' (no quotes)
then check by typing 'ipconfig'
on each computer compare the IP addresses. They should all be pretty similar.
Also with routers, you have to make sure the port with the words 'Internet' or 'WAN' should be plugged into your Modem. The other ports, your desktop should be able to be plugged in anywhere.
So let me know if you can the IP (gateway too if you know how) and where your modem vs your desktop is plugged in at.