Season 1 episode 4 graphics won't start!

I've tried a million different things and no matter what I do episode four only shows up as a blank screen with the text and sound playing. I can't see anything that's happening. I can only hear the voice overs. Please help me and tell me what's wrong!!! The rest of the game is fine, it's only episode 4. I have the PC disc version. Supposed to be brand new.


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