Originally posted by 'AndrewT from Paradoxplaza':Let's look at a few things that cover the most common causes of this:Do you see the game's launcher and the crash happens after that? Or is the crash before the launcher even comes up?Please go to C:Program Files (x86)SteamsteamappscommonHearts of Iron IV CommonRedistDirectXJun2010 and run dxsetup.exePlease go to C:Program Files (x86)SteamsteamappscommonHearts of Iron IV CommonRedistvcredist2010 and run vcredistx86.exe and vcredist圆4.exe.Also if you have the MSI Gaming App installed, disable it as it clashes with this game. Does this fix the mouse not working on the initial launcher as well? Hearts of Iron IV Technical Problems Topic Details.