Although if you have XP with SP1 and provided your wireless hardware will support it, WPA security will be available. It will give you added protection from hackers and is considered more secure than just plain WEP. My laptop has a A, B, and G built in and I have a Microsoft MN700 G wireless router. Supposedly both support WPA but I could not get it to work for some reason. If you want WPA, you should probably stick with a matching set of wireless card and router.