Thank you both for your help! At this point in time, I think we wouldn't want wireless, just a straight upstairs/downstairs connection. We have broadband and the little box says adsl filter (speedtouch) which is connected to downstairs pc, I'm not sure about the modem situation. I have another black box that is connected to the telephone line and through the usb port on the computer. I don't think the upstairs computer has a modem, does that make a difference?
We have a PCWorld in Exeter, I'll try and get over that way this weekend. We've been to Comet and Curry's but they never seem to want to serve us,,,I don't think we smell that bad!! But again, thanks for help and maybe we can get this sorted soon.