Thanks for responding.
But there are things I don't quite understand...
For example, mirex stated that I could find the faulty .avi's and replace them with another, working .avi. However, the only way I know how to even view the movie files by themselves is through Qhimm's "FF8FMV" (and through that method, I found several faulty movies but have no way to replace them).
Also, I'm playing the PC version so I'm not sure how ISO images and emulators would work with it.