Those wishing to use WPA-PSK, the more secure encryption on their network and running W XP will need the information and patches detailed below.
Note this patch is not a critical update so its a DIY install, however you can pick the update from the windows update web page.
Wireless update rollup package for Windows XP
http://support.microsoft.com/?kbid=826942
http://www.microsoft.com/downloads/d...1E0-4C44-94F0-
Overview of the WPA Wireless Security Update in Windows XP
http://support.microsoft.com/default.aspx?kbid=815485
Taken from a previous post of mine