10 days ago - AndrewT - Direct link
In the game launcher please set Display mode to Borderless. THEN go here:
support.microsoft.com

Latest supported Visual C++ Redistributable downloads

This article lists the download links for the latest versions of Visual C++ Redistributable packages. support.microsoft.com And run the x86 and x64 installers there.

IF that doesn't help, Please do a full **clean** re-install:

- move any valued save games elsewhere
- "uninstall" in Epic-EU4
- manually delete both the Epic/EU4 AND Documents/Paradox Interactive/EU4 folders
- re-install game in Epic
- add EU4.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 Epic EU4 or Documents EU4 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 that doesn'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/EU4/settings.txt and pdx_settings.txt .
From your Documents/Paradox Interactive/EU4/logs/ folder, attach here system.log , error.log .  
9 days ago - AndrewT - Direct link
This is certainly Avast getting in the way:
[virtualfilesystem_physfs.cpp:1253]: Could not open file: pdx_settings.txt, error: permission denied
You may need to contact their support to make sure eu4.exe and paradox launcher.exe are allowed to read and write to the Windows user Documents folders.

Good luck!