Well, I don't like Windows XP, therefore I don't know anything about Windows Media Player 10, but you have to keep in mind that this is a BETA VERSION, not final. I suppose you could always downgrade if your problems persist. As for not being able to play in any other media player, are you not able to open the media player and browse for a file to play? That may be the solution for your problem at this point.
-Dan The Man
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