After the latest Windows 10 update (the anniversary update) Hearts of Iron (the first one) was removed from my computer without my permission. Afterwards I reinstalled me and ran it without any problems (except the taskbar being visible during intro movies). Any other people had that problem? And is there a way to stop Microsoft from being massive assholes about trying to control what software I can have on my computer?

There is no way to stop Microsoft from being massive assholes.