(image used with permission)
In April, Windows 7 users will start receiving periodic pop up reminders from Microsoft with the reminder that Windows 7 won't be supported after January 2020. Here's how to prevent or remove those notifications.
Starting in April, Windows 7 users will start seeing a pop up with a reminder that Microsoft will no longer provide free security updates, bug fixes, or technical support for Windows 7. Notifications are scheduled to appear after the release of KB4493132. The patch will be released April 18, 2019 and will be installed if Windows Update is set to automatically install updates. It won't appear on machines that have Windows Update disabled. (See important note below if you've disabled Windows Update.)
The reminder says, "After 10 years of servicing, January 14, 2020, is the last day Microsoft will offer security updates for computers running Windows 7 SP1. This update enables reminders about Windows 7 end of support. More information about Windows 7 end of support can be found here".
You can avoid installing the update by setting Windows Update to, "Check for updates but let me choose whether to download on install them" and not installing KB4493132 when it's issued.
You can hide it and any other update in Windows Update and keep it from reappearing by right clicking on an update and choosing Hide Update. It shouldn't reappear in Windows Update, but I'd keep an eye out for it showing up again. There are a few non-critical updates I've hidden that reappear regularly, such as Microsoft Silverlight.
If the update gets installed for some reason (early release, etc.) you can remove it. If you're unfamiliar with how to find and uninstall an update, you can find out how to remove any update and keep it from reappearing here.
If you'd rather not uninstall it, check the "Do not remind me again" box when the notification pops up in April.
If Windows Update is turned off, Windows 7 patch updates will stop working in July 2019 if a critical patch isn't installed. The security updates were released March 12, 2019. If you don't want to install them through Windows Update, you can download and install the updates manually. Links to the download and more information are in this Microsoft bulletin:
2019 SHA-2 Code Signing Support requirement for Windows and WSUS
This article at Bleeping Computer has in depth details if you want to know more: