Error message - original file could not be found

I recently bought a new PC. All of my iTunes library copied over to the new computer with no trouble, except for digital copies of movies. I even bought 1 movie directly from the iTunes Store and it did not copy over and I cannot download it without buying it again. All of the movies are listed under my purchases, however, when I try to open them I get the above error message. Also, I now get this error message as well on the old computer when trying to open the movies. Any ideas on how to fix this would be greatly appreciated. Thanks!