GoknOz's post in Game Crashed!!! was marked as the answer
You can try these steps:
1. Run the command client (cmd) as an administrator.
2. Enter the following command:
sfc /scannow 3. Wait for the process to finish, and then restart your computer.
4. Launch the game with Steam "Launch with DirectX (64-bit)".
5. Spend some time in the game (5-10 min).
6. Exit the game and start Multiplayer.
Thanks, good games..