If you have tried all these steps and the error persists, please check if you have installed custom maps or mods (common in the Zombies community). A poorly scripted custom map is a frequent cause of unhandled exceptions. To test this, move the mods folder out of the game directory temporarily to see if the vanilla game runs.
Delete any maps that are causing crashes to force the game to re-download them.
: For some users, simply plugging a microphone (or even a pair of headphones) into the 3.5mm microphone jack resolves the crash upon startup. 2. Use Compatibility Mode