Windows 7 will still working after 2020 when Microsoft stop support same like Windows XP.
Big problems are Windows 8 and 10 when use without internet, activation will bother us and lock our computer out to lost our important files! Activation is easy to patch to stop annoy on Windows XP to 7 to disable it and won't lost our important files on hard drive then will running forever without problems. We know and we hate activation problems.
If Windows 10 support is end in year 2025, all people will move to ReactOS instead. Why? Because ReactOS is custom Windows operating system support all Windows 95, 98, ME, 2000, XP, Vista, 7, 8, 8.1, 10 programs and games on it. ReactOS operating system is made in Germany from Europe country. ReactOS don't have annoy activation like in Windows XP to Windows 10.
Don't forget backup your favorite programs and games to your external hard drive, usb flash drive, and other storage like disc (CD/DVD/Blu-Ray with or without M-DISC technology). Also DirectX, XNA, Net framework, etc must have for games to running.
If my Windows 7 is going stop support, I will going try both ReactOS and Linux Mint soon. Forget Windows 10 due to Microsoft spyware built in it to watch us what we are doing. A lot of people are complain on Windows 10 that what old programs and games from XP to 7 don't work on Windows 10 like Vista again. That is know compatibility problems apply to old programs and old games on Windows 10.
You should try ReactOS and Linux Mint to see you like or not. Best to get VMware Workstation program to install on your computer then install different operating system in program to allow install for you to try it out. If you don't like, just delete operating system from list in program and folder (It can find path on your computer running Vista, 7, 8, and 10:
C:\Users\yourusernamehere\Documents\Virtual Machines\here ) without wipe your real operating system, it's very safe to use. There is no risk to your important files on your hard drive or SSD. It's easy for us and we love to learn to try different operating system on our computer. You won't be disappoint with them, just fun for us.
Microsoft want our money and force us to upgrade to new operating is waste our money. Don't listen to Microsoft.