I'm sorry for my English, I'm Brazilian and I'm using the translator.
My system: i5 3330, Graphics onboard, 4GB RAM.
My problem: My game is crashing on the normal Build 41 and IWBUMS (I don't know the difference). When I open it for the first time, it still crashes on the menu, the second time it usually crashes on the map loading screen, when you finish loading and the map appears, a 5 error message will also appear in the lower right corner of the screen and the third time it crashes while playing, after a few moments. He just stops responding, and closes. It also features some graphic bugs where the shadow of the character and the walls is square. I think it's because of this error message.