How can I use an mpeg in Premiere cs6? I converted it to an mov and it still wont work

I am trying to use an mpeg file in my premiere pro cs6 project.  It is stock footage I bought online. It imports but when I try to play it is stuck on the first frame.  I converted the file to an mov in quicktime and it still wont play in premiere. I am on a mac. Please help. Thanks