Windows Media Center isn't part of Windows XP Professional. It
was only available in Windows XP Media Center Edition.
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Windows XP Pro, XP Home edition, XP media center edition, XP
tablet PC edition, XP pro x64
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Windows XP Media Center edition is not available for purchase
except with a new computer, although you can always download
torrents of it from sites such as the pirate bay.
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XP Media Center Edition is 32-bit only.
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Windows XP Media Center is a version of the Microsoft XP
operating system specifically design to operate as a home
entertainment hub. The first edition of this software was released
in July 2002.