I have installed the Crysis 2 MP Demo for PC but I am getting some issues in it. While I connect a server and the game begins; the whole thing goes usual, I can still play for a small number of seconds. But, afterward, the entire screen turns black, apart from my HUD. I can at rest perceive sound myself walking, shooting, getting killed, except I cannot observe anything. One more problem I encountered was that I might not sign in by the use of my Crysis account. I tried registering different account with different name with different Email but nothing worked for me. Can anyone help me?