Windows 10's free, guaranteed security updates stop in October 2025, less than a year from now. Windows 10 users with supported PCs have been offered the Windows 11 upgrade plenty of times before. But now Microsoft is apparently making a fresh push to get users to upgrade, sending them full-screen reminders recommending they buy new computers. The reminders, which users have seen within the last few days, all mention the end of Windows 10 support but otherwise seem to differ from computer to computer.