Most antiviruses that work on Windows 11 will also support 7 and 8, but it depends on the individual plan. The comparison table above details which antivirus plans are compatible with Windows 7 and 8 as well as Windows 11. If you’re still unsure, you can take a look at the system requirements for your chosen antivirus package. These will be available on the antiviruses’ website, usually on the same page as the plan details. There, you’ll see exactly which versions of Windows the service will work on.