Not quite sure why that's happening. Do you happen to have the Oculus app (for the Oculus VR if you have one) installed on your PC? I heard it sometimes causes black screen issues for some users, so you could try uninstalling it and see if the game works. If not, try disconnecting from your internet before you launch the game and see if it works. If none of the above works, I'm afraid I don't know what else could be the issue, sorry!