WPA2 Update for Windows XP with Service Pack 2 is available
The Wi-Fi Protected Access 2 (WPA2)/Wireless Provisioning Services Information Element (WPS IE) Update for computers that are running Microsoft Windows XP with Service Pack 2 (SP2) is available.
This update enhances the Windows XP wireless client software with support for the new Wi-Fi Alliance certification for wireless security. The update also makes it easier to connect to secure public spaces that are equipped with wireless Internet access. These locations are otherwise knows as "Wi-Fi hotspots."
additional information and download URL : http://support.microsoft.com/kb/893357/en-us