It's not clear to me if the game has never worked on this machine, or used to work and now does not.
NEVER WORKED: try installing:
First:
http://www.microsoft.com/download/en/details.aspx?id=8328
Then:
http://www.microsoft.com/en-us/download/details.aspx?id=35
(If that doesn't do anything then
http://www.microsoft.com/en-us/download/details.aspx?id=8109 )
Then: visit the Windows Update site and allow it to apply all .NET updates/patches it wants to, for all .NET versions.
USED TO WORK: try a full
clean re-install:
- move any valued save games elsewhere
- "delete local content" in Steam-EU4
- manually delete all files and folders left under Steam/EU4 AND Documents/Paradox/EU4
- re-install game in Steam, run a Steam Verify when done.
IF NEITHER HELP: post a dxdiag.txt (you can delete everything after the end of the "Sound devices" section for brevity) and your Documents/EU4/settings.txt. From your Documents/Paradox/EU4/logs/ directory, post system.log . Open setup.log in notepad and search for 'checksum', post that line only here too please