Thanks guys. Had tried Satcomer fix without any success. I then though I'd uninstall parallels as it seems to create virtual network ports on startup (I checked the logs) and (I cross my fingers) has seemed to solve my problem. Maybe I'll have to start using VMWare - I hear it's just as good.
I have 2 airport express' (n) in a set up as a wds network. Both have the same network name, same channel, same password(wpa2personal). One is obviously connected to my cable modem (main) and the other in the Lounge (remote). My iMac that sits right next to the 'main' base station behaves...