So they have never worked on this computer?
For CK2:
Please go to C:\Program Files (x86)\Steam\steamapps\common\Crusader Kings II\ _CommonRedist\DirectX\Jun2010\ and run dxsetup.exe
Please go to C:\Program Files (x86)\Steam\steamapps\common\Crusader Kings II\ _CommonRedist\vcredist\2010\ and run vcredist_x86.exe and vcredist_x64.exe
Also if you have installed a gaming VPN app called Evolve, or the MSI Gaming App, disable it as it clashes with this game.
For HOI3:
Please go to this folder:
...\Steam\steamapps\common\Hearts of Iron 3\install\
Run each of the four .exe files in there in turn. Then go down into the DX folder there and run dxsetup.exe
THEN manually delete both these folders if present (assuming default installation locations):
- C:\Program Files (x86)\Steam\SteamApps\common\hearts of iron 3\map\cache
- C:\Users\YOUR-USERNAME\Documents\Paradox Interactive\Hearts of Iron III\map\cache
If still present.