you must be using a wireless addapter for the laptop, correct?
either way, have you configed the ip and dns settings or are you relying on the obtain ip automaticly. you can goto start menu,run,ipconfig /all to see what you may need to enter into the feilds under (my copmuter,network and dialup,local area conections) right click on local area conect and select properties. left click on tcp/ip once and select properties. then you will see the feilds that you may need to config.
i myself in 2 situations needed to enter this data in one and could rely on automatic settings in the other. i assume it is a router related thing.
i'll do my best to walk you through every step to get this to work. i know how how you feel.