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In the game launcher please set Display mode to windowed.

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

IF NEVER:
Install ALL these Microsoft modules:

(run dxsetup.exe after extracting from this download)

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.


IF IT USED TO WORK:
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/CK3 folders
- 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

In particular make sure there are no files or folders left under either the Steam CK3 or Documents CK3 locations, before installing again.


If those don't 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/CK3/pdx_settings.txt .
From your Documents/Paradox/CK3/logs/ folder, attach system.log , error.log
 
I had a message that something went wrong at visual 2015. It previously work correct . maybe it help but about 3 weeks ago i had to return pc to fabric settings.
 

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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.
I had a message that something went wrong at visual 2015. It previously work correct .
If that just says a newer version is already installed, that's fine. If it said anything else, please tell us what that is!
 
IN translation it means te installation didn/t go well
 

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If VisualC++ cant be installed you seem to have much deeper system level issues on your computer

Id maybe try and run a full windows update and ensure that all patches are installed properly
 
IN translation it means te installation didn/t go well
If that just says a newer version is already installed, that's fine. If it said anything else, please tell us EXACTLY what that is! Thanks.
 
That's probably fine then. All the other installers went okay?

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.
 
I can see that your Windows 10 has not had any major updates applied for over 3 years. Our games are only ever tested against Windows that is fully patched up.

Please run the Windows Updater app, and look for a new Win 10 version to install - not a patch or update but a whole new version. Apply that and reboot. Then run the Updater again, apply everything it finds, reboot, run it again ... keep doing that until there is nothing to apply. Boring I know, but you have a lot of catching up to do!

I expect the game will then work for you.

Good luck with that!