Many people continue to use vintage computers, running operating systems that are past their end-of-support date. While I recommend that these users upgrade to something modern and more secure, I understand when they stick with their classic machines. I don’t judge.
But if those computers are going to hit the internet, they do need antivirus. And as they age, it becomes more difficult to find an antivirus software that is willing to run on a much older OS. Below are some links to free antiviruses that are compatible with bygone OSes, like Vista and El Capitan.
My favorite free antivirus for older PCs is Microsoft Security Essentials. But Microsoft pulled this from their sites, so use these links to get the 32-bit version or the 64-bit version . It will run on any XP, Vista or Win7 computer.
AVG still offers a free antivirus that works on XP and Vista and Windows 7.
You can also consider Avast Free Antivirus, which is equally compatible.
There’s some debate on whether Macs need additional antivirus protection. For now, I’ll say: You are at greater risk if you’re using an out-of-date computer, so antivirus becomes more relevant if you’re not running the latest MacOS. If your MacOS is so old to be completely out of service, please get some antivirus ASAP.
AVG offers free antivirus for Macs here, and can install on MacOS 10.13 High Sierra or newer.
Avast offers free antivirus for Macs here, and can install on MacOS 10.11 El Capitan or newer.