This happens only in the menu and I don't understand why, every other game I have work just fine. I tried: Uninstall and reinstall bo3, unplug every usb device I have, restore windows, change power supply and RAM sticks, changing the "Fraction of video memory usage to target" in config.ini.
This is an issue with the anti-cheat. Some background stuff is triggering the anti-cheat. fix as u/coins22222 said : Win+R -> type 'msconfig' -> go to 'Services' tab -> click 'Hide all microsoft services' -> either "disable all" and work your way till you find it OR disable known services that conflict with the anti-cheat. known services that If you attempt to use a Call of Duty: Black Ops 3 code to get a digital item you may run into issues. Two common problems are messages telling you the code is already in use or the code is invalid . 16 8 496 106 420 240 420 201