I've just got myself a Belkin wireless G router/modem and a wireless USB adaptor and I'm just trying to set it all up.

So far I've networked my XBOX to my PC, the 360 to the PC (and XBOX live) which are all going through ethernet cables.

The problem I'm having is the adaptor on the PC upstairs is sensing the router but it won't or can't connect to it...

Anyone got any suggestions?