[2020] CK3 crashes on launch

DXDIAG is a program you run from a command prompt or the Windows start menu 'run' dialog box (or 'search programs' in Windows 7 or later). After running it will open a window and start collecting info with a progress bar in the lower-left corner. When it completes click the 'save all information' button and save it to a file then attach that file here.

Please attach your Documents/Paradox/CK3/pdx_settings.txt .  

Your Windows 10 has had no major updates applied for over 3 years. Our games are only ever tested on Windows that is fully patched up.

Please run the Windows Updater, and look for a new Windows 10 version to apply. Apply it and reboot, run the updater again, apply everything it suggests, reboot - keep doing that until totally up to date. Boring I know but you have a lot of catching up to do!