HT2519: Download past purchasesLearn about Download past purchases
Currently Being ModeratedMay 15, 2013 12:55 PM (in response to Nykteria)
Welcome to the Apple Support Communities. If you want to reset the iTunes library, the following article will walk you though creating a new iTunes library.
Once that is completed, the next step would be inserting in the media.
If you do not know where the iTunes files are located, the following article will set you in the right place.