Are you sure the internal card is wireless N?
I have a netgear ragemax wireless router and a sony viao notebook running vista. I can not figure out how to get more than 54Mbps with my wireless internet. I have tried redoing the wireless settings, but I still can not get the speed. I know my computer has a card with draft n. I happened to have a usb adapter and if I use that I get speeds greater than 54mbps, but I would like not to have the adapter sticking out since I do move the laptop from time to time. Please Help!