Aiport/netgear Compatability


I've had my Airport Extreme hooked up for about 2 weeks now.
I can connect fine (iBook G4). My roomate's computer (a Dell), however, cannot. She has an external Netgear Wireless Card that works when she goes to a public WiFi establishment. At home she can't seem to get onto the network.

Her computer reads that she's getting a signal, but when she opens internet explorer it gives her the "Cannot find Page" message.

Any Ideas?