Black Screen on launch

sarcofago666

Hello, I need some help. I bought this game yesterday by steam, so when I try to launch the game my screen stay 'black' and it says "invalid format".
I have a Intel Quad Core 2.40 GHZ, RAM 4 GB, my OS is Vista Ultimate 64 bits, and my graphics is a NVIDIA GeForce GTX 550 Ti 1GB.
My monitor is a LCD of 37" LG with a resolution of 1768x992.

HELP ME PLEASE!!
THANK YOU.

sarcofago666

I resolve my problem!! just I had to reduce the screen resolution!!