wmp 9 problems

I have windows xp at my computer and we are two users, me and my brother.I recently installed wmp 9 and mine works perfect idon't have any problems.At my brother's there is the media libray button but if you push it nothing happens.As a result he doesn't have playlists.he can only play songs at 'now playing' playlist that can't be saved.

Any ideas??
 
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