Itunes is not downloading several tracks from several albums purchased on itunes.

It keeps saying an error ocured while downloading. There are about 37 tracks that wont download and some cover art etc.

I tried going in and restarting the download. I have tried restarting my computer. I have tried everything I can think of and I am very frustrated. I am not very good with computers so any help would be very appreciated.

Thanks so anyone who replies!

Sarah