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Those errors may or may not be anything to do with your crash.

Is this happening in every campaign you play, or just one particular one?

Are there any mods involved here?
 
Please do a full **clean** re-install:

- move any valued save games elsewhere
- "uninstall" in Steam-CK3
- manually delete both the Steam/SteamApps/common/CK3 AND Documents/Paradox Interactive/CK3 folders - In particular make sure there are no files or folders left under either the Steam CK3 or Documents CK3 locations, before installing again.
- re-install game in Steam, run a Steam Verify when done.
- add CK3.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.
- start the game with no mods active and test with a new campaign, NOT any existing one.


If those don't help:
DXDIAG is a program you run from the Windows search box on the task bar. 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 here your Documents/Paradox Interactive/CK3/pdx_settings.txt .
From your Documents/Paradox Interactive/CK3/logs/ folder, attach here system.log , error.log , exceptions.log
 
Did you do the clean reinstall I described? Because that error log looks even worse if anything!

Was there no system.log file?

Right click on ck3.exe , properties, compatibility. Tick "disable fullScreen optimisations" untick every other box in that dialog, Apply and exit.
Then in the launcher Game Settings menu, select fullScreen display mode, Vsync off, cap refresh rate at 60.

THEN start a new test campaign. Is that any better?
 
Did you do the clean reinstall I described? Because that error log looks even worse if anything!

Was there no system.log file?

Right click on ck3.exe , properties, compatibility. Tick "disable fullScreen optimisations" untick every other box in that dialog, Apply and exit.
Then in the launcher Game Settings menu, select fullScreen display mode, Vsync off, cap refresh rate at 60.

THEN start a new test campaign. Is that any better?
Still no system log file, it still crashes
 
Please run this Windows repair tool

If that doesn't help, make a new Windows user on this machine and log into it with that. Do you get the same problem there?


BTW I assume HOI4 works for you okay, this problem only affects CK3?