@xAtomic
It could be that you haven't installed the other DLCs correctly. In any case, I would recommend getting the game and all the DLCs through Steam. I know it's not cheap, and it's probably not worth it.
But be aware that if you don't have a Steam copy, you won't be able to get any support here, since most of the issues you may encounter can be resolved by using Steam's "Verify integrity of game files" option
