Check that your Antivirus/Firmware or whatever is not blocking the game. Try disableing it or adding BlackOps3 to the exceptions. 2. If that doesn't wrok navigate to where you game is installed (by default should be) "C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops III" and try to execute the game, by clicking on "BlackOps3 If you have an nvidia gpu, open up geforce experience, update the video card driver and use the nvidia optimal settings (it might set them really low, but it'll make it full screen) once you are in, you can go into the settings and change them as you please. luk3d. • 8 yr. ago. One time? In Steam, right click on the game Click on "Prosperities" Click on "Language" and change it to the language of your preference. Worked fine for me, but I have a "global" key. Vatso308. •. 5Euw.