Please run this Windows repair tool
Describes how to use the System File Checker tool to troubleshoot missing or corrupted system files in Windows 8.1, Windows 8, Windows 7 or Windows Vista.
support.microsoft.com
If that doesn't help, make a new Windows user on this machine and log into it with that. Do you get the same problem there?
BTW I assume HOI4 works for you okay, this problem only affects CK3?