I've been trying for hours to get penumbra black plague to work on my Windows 8.1 desktop. The game launches, but the mouse pointer is on and off the screen when I move it. If I'm lucky I can get the game to start, but it doesn't run right and it's unplayable. I tried adjusting settings in the default settings .cfg file but no luck. I verified the game cache through steam and tried reinstalling it. I read on other forums that this game works with windows 8, so I don't know what the problem is. My PC is running the fx 6100 with a radeon 7850