[2021] CK3 Crashes Randomly

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 your Documents/Paradox Interactive/CK3/pdx_settings.txt .
From your Documents/Paradox Interactive/CK3/logs/ folder, attach system.log , exceptions.log  

Aside from the BEX64 errors in ck3.exe we see in there, there's also a Windows error Bad Module. Sadly MS don't tell us which one!

Would you say you are having any other Windows issues on this machine?

If you run the Update app does it find anything to apply?

And you could try this repair tool too:

Use the System File Checker tool to repair missing or corrupted system files

Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows 8.1, Windows 8, Windows 7 or Windows Vista. support.microsoft.com
Good luck with that!  

That was the hard drive Windows is on, C: ? In other words this is a clean Windows reinstall? Or some kind of backup and restore process?