Valve's Steam Digital Gaming PlatformAnnouncingIt will stop supporting the Windows XP and Vista operating systems that Microsoft has terminated support. As of January 1, 2019, the Steam client will no longer work in these versions of Windows. Users need to update to a newer version of Windows to continue running Steam and all games or other products purchased through Steam.
Steam claims that its latest feature relies on a Google Chrome embedded version that is no longer available on earlier versions of Windows. In addition, future versions of Steam will require Windows features and security updates that are only available in Windows 7 and later. Steam can still continue to run and start games on Windows XP and Windows Vista, but other features will be limited. For example, new features such as the new Steam chat will not be available. It recommends that users who still use these operating systems upgrade to newer versions of Windows. According to Steam's operating system statisticsdataAs of May 2018, only 0.22% of users were still running XP.