PCs are all about backwards compatibility, but this can lead to problems. Games designed for DOS or even just earlier versions of Windows may not work properly on modern versions of Windows without some tweaking.

We’ll walk you through the basic things you need to know when trying to troubleshoot games — much of this applies even if you’re purchasing old games from Steam.

via How-To Geek http://www.howtogeek.com/170068/how-to-troubleshoot-issues-with-pc-games/