about 3 years ago - AndrewT - Direct link
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/Stellaris/settings.txt and pdx_settings.txt .
From your Documents/Paradox/Stellaris/logs/ folder, attach system.log , error.log .  
about 3 years ago - AndrewT - Direct link
[23:27:12][virtualfilesystem_physfs.cpp:1193]: Could not open file: settings.txt, error: permission denied
Your antivirus app is preventing the game from making that missing settings.txt file. With the MS store edition this is a bit trickier to deal with that with Steam, as MS lock down the game's installation folder so tight you cannot get to it.

Whatever antivirus app you use, it should have a place where you can see what it has recently blocked. Go into that screen and allow through stellaris.exe and paradox launcher.exe at least.

Good luck!