Hi! I have a strange problem: in some places in the game appears a small screen in the top left of the screen,like picture-in-picture, only it shows the same thing as the rest of the screen.It could be a virus?Thanks!!!

Yeah, I was wondering about that too.

1.) Auto adjust you're monitor when you start the game. (that worked for me.) 
2.) Adjust Video settings to fit you're graphics card 
3.) Do a fresh install 
4.) Restart you're computer  
By the way, this game is a god among mortals, just saying, it's really fun!

I'm having a similar problem... when the post effects are turned on, in some places I get the screen effects split in half, it's like, the same image on top and bottom of the screen.