I play Civilization IV. It use to work fine with Windows 8.1 then approximately a few days ago it stopped working stating I need to run it as an administrator. I change the settings so I can run it as administrator, but the game will not open.
I then decided it would be a good time to upgrade to Windows 10 and see if that fixes the game. After my upgrade to Windows 10, I have the exact same problem. When I run the Windows troubleshooter it states there is a compatibility issue and recommends Windows Vista Service Pack 2. I try to run it under that and it still will not open the game.
I tried reinstalling the game, but it still does not work. I think some type of Microsoft update in Windows 8.1 and Windows 10 makes this game now unplayable.