Dell no longer finds wireless networks (by 2 users)

My girlfriend's Dell laptop no longer finds wireless networks. When I go to try and see the available network connections I only get two options: A 1394 Connection and the Local Area Connection. Neither of which allow the laptop to actually connect wireless to the network. The laptop can get onto the Internet once it's connect via an Cat-5 cable. Other than that, it's a no-go. I've tried myriad things, including disabling the 1394 connection - something I read on some forum. Might you be able to offer some ideas/assistance? Thanks.