We live in a three-storey house. The wireless internet router is in a room on the bottom floor, I live on the top and I get full signal, as does everyone else in the house apart from in one guy's room, where there's hardly one bar. Several of us have taken our computers in there, and it's exactly the same - as soon as you step through the door, it goes. His room is directly above the kitchen, which is right next to the room with the router in. Does anyone have the faintest clue what could possibly be wrong?