Airport Linksys issues

I'm trying to connect a Windows XP OS commputer to my Airport hub.
I already have two I-books working on it. I want to connect a Sony Vaio using the USB Linksys product. Although the Airport hub can see the Linksys, I can't access the Internet.

Does anybody know the trick to make this work?

I am having a similar problem. Here is my current setup. I have an airport extreme base station, an iBook with extreme airport card, and a PC with a linksys wireless G PCI adaptor. I can access the internet with my iBook with no problems. However, the connection is present between the PC and the airport, but I can not connect to the internet. I'm not sure if it has something to do with the settings?