Run a security scan to remove any viruses or malware infections. Try creating a new administrator account to resolve permissions issues. Uninstalling and reinstalling the Blizzard App may resolve rare launcher issues.
If you're having trouble connecting to the Call of Duty: Modern Warfare, you should first check Call of Duty: Modern Warfare Server Status. If the status indicator for your platform is not green or an alert is present, you might encounter connectivity issues until service is restored and fully operational.
World at War (2008)\n\n The fifth Call of Duty installment, World at War, was the official introduction to the famous Zombies mode. This is where Nazi zombies originally came from. World at War's Zombies were not campy, and just genuinely terrifying.
Call of Duty's staple game mode, Zombies, was initially a fun game mode, with no future in sight. That was until the credits rolled for gamers in Call of Duty: World at War, and fans were introduced to the zombie horde.