Take a look here for assistance. Many that have upgraded to WMP11 have
rolled back to v10 due to many problems encountered.
Release Notes for Windows Media Player 11 for Windows XP
http://www.microsoft.com/windows/windowsmedia/player/11/readme.aspx

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XP - WNP
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> Having just switched from Media Player 10 to version 11 , I cannot find the
> tool to manage and backup licenses on downloaded music. Can anyone help?