Clean up itunes folders in windows7

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Hello all,  I have recently uninstalled and reinstalled itunes to the computer a few times. 
There are now multiple "Previous itunes library", "album artwork" and "itunes media" folders on the computer.
I like to keep things organized.  In the left tree structure you can see 3 "previous itunes library" folders.  This makes me crazy.  Whats would be the correct one's if any to delete? 
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Replay

Hi,
You need Doug's applescript - "Super Remove Dead Tracks" You can get it here - http://dougscripts.com/itunes/ixarch/arch.php?my=2007-03#032007a
Regards