The original bug report :
The fix that worked for me :
1. I had EasyAntiCheat_Setup.exe and ww3_launcher.exe running as administrator, I removed that.
2. Verified the game files.
(I don't know if step 1 and 2 are really necessary but that's what I did)
3. Enabled Driver Signature Enforcement by running the following commands with administrator rights (run cmd as admin)
bcdedit -set TESTSIGNING OFF
bcdedit -set NOINTEGRITYCHECKS OFF
bcdedit -set DEBUG