Unfortunately, many network cards and/or drivers from the Win XP era do not play well with WPA/WPA2 networks; connecting may require experimentation, patience, and/or cursing, or it may not be possible with your hardware. (SP2 with WPA updates supposedly will do the trick, but SP3 is a good idea anyway.) The exact interface depends on the software you're using to manage wireless network connections; refer to the summary at the top of this document and the help pages or other documentation for your computer.
See Windows XP WPA2-Enterprise using IEEE 802.1X | for one step by step guide that may help.
WARNING: Most versions of Android Older versions do not directly support WPA2-Enterprise.Windows XP does not have a built-in way to scrub saved WPA credentials - see How to remove cached user credentials that are used for PEAP authentication in Windows XP.As of December 2013, the QOOQ tablet does not support WPA2-Enterprise.6) Make sure the Validate Server Certificate box is checked and click Configure.7) Uncheck the Automatically Use Windows Logon box. 8) Click inside the box that pops up on the bottom-right of the screen.
If you run IPCONFIG \all with the wire connected, what do you get?