Game starts up fine and the first missions are playable. However, as soon as you enter the subway/underground the game starts crashing every few shootings. Usually, if you manage to quicksave right before a point where it crashes you can continue the game after loading that quicksave. This does not work at a later point ("The L") where the game just freezes at a specific point. I tried quicksaving my way around it but it doesn't work. Also the freezing happens in a certain area and not a specific point. Guess something scripted is going on in the background that the game doesn't like.