It's a cpu problem apparently. I made this tutorial yesterday and the fix worked for me but now this doesn't work because I can't seem to find the thread count part in the notepad (You will know what I'm talking about if you watch the video).
Hours after I made the video, treyarch/activision removed the thread count part of the notepad. This means they are working on the problem and It should be fixed very soon. Also, whats your steam? Me and muffins got the game, we can play together.