I have installed Ubuntu x86 10.04 LTS onto an old Dell machine which is connected to my broadband modem and Netgear Wireless Router (WGR614 v6). The router is encrypted with 64-bit WEP and allows my System76 Pangolin Performance laptop to connect flawlessly out of the box. However, my sister runs Windows XP Professional 32-Bit on a Dell Latitude D830. This Dell Latitude's wi-fi card is an Intel PROSet Wireless which recognizes the router but can't access it.
What should I do on her laptop in order for her to access the wi-fi router?