if your having the issue of getting wrong album arts in the center of wmp then your in the right place,
to apply the fix you first have to check "show hidden files" and uncheck "hide protected operating system files" in the folder options menu
to access the folder options window, you can either type folder options in search bar when you press the windows key, or open any explorer windows and press alt-->tools-->folder options & the view tab
the settings :
-After doing the above go to your music folder (where your songs are getting the wrong album art) you'll have to delete Folder.jpg, if its not working then delete every semi hidden file with the name similar to this "AlbumArt_{7C536F08-2066-41E4-BC71-507ECAD0E44A}_Small" in the same folder