When your wifi card's utility does not support WPA you must use Windows WZC. See http://www.google.com/search?hl=en&q=wzc&btnG=Google+Search to catch up what that is and possible ways to use that instead of your wifi card's utility.
I recently updated the settings on my wireless network from wep to wpa and when I tried to connect my dad's older windows xp computer to the network it says that I don't have the right length of wep key. I downloaded and installed service pack 3 hoping it would add wpa support but it hasn't helped. How do I change it so that it is a wpa setting not wep. Thanks for your help.