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Edit documents/paradox/ck2/settings.txt as follows:
fullScreen=no
borderless=yes

IF that doesn't help, Has the game ever run OK on this computer? Or never?

IF NEVER:
Install ALL these Microsoft modules:

https://www.microsoft.com/en-au/download/details.aspx?id=8328
https://www.microsoft.com/en-au/download/details.aspx?id=13523
https://www.microsoft.com/en-us/download/details.aspx?id=52685
https://www.microsoft.com/en-us/download/details.aspx?id=8109
(run dxsetup.exe after extracting from this download)

Add ck2game.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.

Also if you have installed RivaTuner, RadeonPro, or a gaming VPN app called Evolve, or the MSI Gaming App, or Duet, disable it as it clashes with this game.


IF IT USED TO WORK:
Please do a full **clean** re-install:

- move any valued save games elsewhere
- "uninstall" in Steam-CK2
- manually delete both the Steam/SteamApps/common/CK2 AND Documents/Paradox/CK2 folders
- re-install game in Steam, run a Steam Verify when done.
- add ck2game.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

In particular make sure there are no files or folders left under either the Steam CK2 or Documents CK2 locations, before installing again.

Also if you have installed RivaTuner, RadeonPro, or a gaming VPN app called Evolve, or the MSI Gaming App, or Duet, disable it as it clashes with this game.


IF NEITHER OF THOSE HELP:
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/CK2/settings.txt
From your Documents/Paradox/CK2/logs/ folder, attach system.log .
 
Thank you so much! I was able to make the game run after doing a clean reinstall and removing all the save files, but it stops working when I put the save files back. Also, I do not know how to find the exceptions list of my antivirus or of my Windows Defender. Can you help me with this at all?
 
Probably you have a corrupted save game file. Move then all out, then back one by one to see which is bad.

If you have installed no antivirus app then Windows Defender is what you have for that purpose. Imn the Windows search box put Ransomware. Eneable Controlled FOlder Access if disabled, then add ck2game.exe to the Apps Allowed Through list in there.