Right now I would rip your arm of for that switch or any switch !, I have been trying to network 2 win 7 boxes together and a xp machine. box a,b,c box c being xp. box a can see box b on the net and access it, box b can see a but not access it, I am not into homegroups as it causes problems between xp ( box c )and win 7 when communicating. Anyway, nothing I do on any of the boxes lets box b access box a or c. I am personaly now of the opinion that it is something to do with the nasty bt homehub2 router I have. So a switch may be the answer, just cant afford one at present.Box a and c are in fact alternatively connected to the same connector.