With Dell Laptops and wireless problems in vista the route cause has in general been form my experience with the wireless card not being completly compatible with vista and as intel are the main suppliers of wireless cards to a vast majority of of computer manufacturers it is intel and co and this includes microsoft to get their act together before launching new operating systems. If I remember when NT first appeared there were similar problems with compatability in the early days, so be patient and all will come out in the wash.