You have another 3 years before WIN 7 security support ends. No OS is immune to malware, don't buy into this myth, so long as you are connected to the Web. If you're not intending to connect to the internet after 2020, than you can run WIN 7 as long as it continues to operate.
Personally, I've upgraded all my notebooks to WIN 10. My desktops are still running WIN 7 Pro, and intending to do so until 2020. Then upgrade to WIN 8.1 Pro, already have the licenses. Even building a new Intel i7 12-core Titan graphics workstation. Another AMD 8-core workstation. Both will be running WIN 7 Pro. The issue is that it would cost me thousands to upgrade my media/graphics software for WIN 10 compatibility. No hurry to do so.
I literally use WIN 7 Pro, MAC OS X, and Linux RHEL/CentOS at work everyday. So familiar with all three. A Linux distro such as Mint might be a good option after 2020, though have not used Mint personally. Especially, if you primarily need it to access the internet. Do like Linux GNOME desktop.
