TV shows and movies not working after being backed up

in Genius Bar edited January 2014
I backed up all the movies and tv shows in my iTunes library to the hard drive of my iPod and then reinstalled mac os 10.5 on my MBP. When I put the movies and tv shows back on my computer some of the movies did not work and almost all of the tv shows that had purchased from iTunes did not work. Some of the movies that I did not purchase from the iTunes store will make iTunes quit. Is there anyway to fix this?
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