Sorry to hear that!
From what you're describing it's likely an issue with the opening mp4. From what I understand usually what causes that is an issue with graphics card drivers, for now all I can suggest is trying to update your graphics card drivers and see if that resolves the issue. I will release a patch that will give people the option to skip the opening cinematic before it tries to load the mp4, you'll just need to wait a bit though.
EDIT: While I'm working on a proper patch for this, you can also just change the name of the mp4 file to something random so that the game just doesn't open the video at all. It should be in the game files under "opening_fmv.mp4"