Windows XP 有很多版本:
Windows XP Home Edition
Windows XP Professional Edition
Windows XP Professional x64 Edition
Windows XP Media Center Edition 2005
Windows XP Tablet PC Edition

請參考微軟網頁:
http://www.microsoft.com/windowsxp/default.mspx

"Windows XP Media Center Edition 2005" = "Windows XP Professional Edition" + "Microsoft Media Center" + ...