@Troy McClure Have you found a solution to your problem. If you have I'd be interested to know what the cause was. I've never got anything off itunes but I thought all the files were AAC. I'm going to take a wild guess and say that because they have been purchased from Itunes they are protected to play with only apple products i.e itunes, ipod, iphone etc.
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negative1 Yes it is odd but that was the problem. Can you provide a reliable online source regarding the music conversion thing. This is news to me.