Earlier in November last year, Avast and Steam announced they will abandon Windows XP and Vista users, and the time has come. As of today, the 1st of January, Steam is no longer functional on both these operating systems.
Valve explained the reasoning behind the decision was due to both operating systems’ users resembling a mere 1% of the total Steam userbase. Not only that, Valve’s upcoming features, and even existing new features such as Steam Chat, will experience limited functionality due to both operating systems’ inability to run Steam’s embedded version of Google Chrome.
Starting on January 1 2019, Steam will officially stop supporting the Windows XP and Windows Vista operating systems. This means that after that date the Steam Client will no longer run on those versions of Windows. In order to continue running Steam and any games or other products purchased through Steam, users will need to update to a more recent version of Windows.
The newest features in Steam rely on an embedded version of Google Chrome, which no longer functions on older versions of Windows. In addition, future versions of Steam will require Windows feature and security updates only present in Windows 7 and above.
For the remainder of 2018 Steam will continue to run and to launch games on Windows XP and Windows Vista, but other functionality in Steam will be somewhat limited. For example, new features such as the new Steam Chat will not be available. We encourage all users on these operating systems to upgrade to newer versions of Windows in order to have ongoing access to the latest features of Steam, and to ensure future access to all games and other Steam content.
Make sure to upgrade to Windows 7 or later if you wish to keep using Steam on your PC.