Disable Your Antivirus Programs/Windows Defender FirewallĪccording to many user reports on communities, some antivirus programs like Avast can provoke the issue “Crusader Kings 2 crash on startup”. If it still doesn’t work, try the following solutions. In addition, you can restart your computer to turn off unnecessary programs completely.
So, we recommend you close other third-party programs in Task Manager first. If any programs are conflicting with the game, you may experience Crusader Kings 2 crash on startup. Disable Fullscreen Optimizations and Run the Game as an Administrator
Disable Your Antivirus Programs/Windows Defender Firewall
