I just created an airport extreme network with an extreme base station and an airport express base station, this all works fine and I can stream itunes and wirelessly connect to the internet from other rooms. My problems start when i try to add a pc laptop with a belkin wireless g network card to the network. After installing the belkin software and inserting the card into my laptop the wirless network created with the extreme base station is recognised from the pc. But when i try to connect to the network i keep on getting asked for a network key???

I'm tearing my hair out and had a very long night trying to suss it out. Can anyone help me.