Ffdshow is a DirectShow codec that decodes many types of audio and video formats; it may have been installed as part of a media player or converter program, if you didn't install it yourself at some point when you ran into a file you couldn't play.
There should be an option to set it to always be used or not with particular applications. I used it awhile ago, but uninstalled it troubleshooting a conflict with another program.
Try uninstalling ffdshow, and see if that helps with the cutscene problems. A couple people have had codec problems (don't recall if ffdshow was one of them, or not) and clearing them out or updating can help.
Theory on my CTD at the Start New Game Load Screen