Steam Support page, Valve said that it will soon be discontinuing the platform for PCs that run on Windows 7, Windows 8, and Windows 8. At this time, PCs that still run on these older versions of Windows will no longer be able to run games that are owned through Steam or purchase any other titles through the marketplace. At this time, PCs that still run on these older versions of Windows will no longer be able to run games that are owned through Steam or purchase any other titles through the marketplace