I had to start over because the screen went black after the knife scene, and I had to start over because it crashed while I was being chased in a crouching position.
I wonder if I could still have gotten away with a minor injury if I had a save in the middle of the game.
Other than that, my PC malfunctioned and Explorer crashed several times, forcing me to restart it.
It's a shame, because the main game is good.