Did you delete files?  Hopefully you have em backed up somewhere, if not reinstall the game. Chances are you're seeing this because of the driver version you're using.  According to your DX you're on win10, might serve you to try a different driver than the one you're currently using, quite possibly an older one from win 8.1 might suffice to fix your problem.  800x600 is a good "safe" setting for the resolution, but most likely thanks to yo