Grundin

When I start the game at the part were you come out of the health tube device the game basically skips that whole cutscene. My character and most of the doors are just black with no detail aswell as a lot of containers and surfaces. I go to walk to the through the first door and some of the time I get as far as getting inside the morgue before my charcter will just stop. I can look around and stuff but the W,A,S,D keys dont dont do anything. Also right from the start the main menu in game flickers and freezes the game if I stay in it too long. Any help with this problem would be greatly appreciated.