I have an airport extreme broadcasting to an iMac and Macbook and never loose the wireless signal to these. I have my upstairs PC running windows XP actually plugged into the extreme...and this is the machine that keeps losing the connection! I don't even know what to check. I'll be browsing and then all of a sudden, no internet...even though the apple machines are still going fine wirelessly. I'll try to repair the connection but that's never helped. I have to reboot the XP machine and then it's back online again. This never even happened with the 5 year old SMC router I replaced. Any ideas...?