Microsoft stopped officially supporting Windows 7 for regular users in 2020 and Windows 8.1 support ended in 2023. At best, you've had a year to update to a newer version of Windows. At worst, you've had four years. You should have moved to Windows 10 or Windows 11 by now if you are online at all with those operating systems. Years of no security updates is bad enough, but this week it just got worse.
Valve officially...