My sister and I run AVG free version on our Windows 7 laptops. It has cleaned up issues that expensive Kaspersky completely overlooked.
We have a contract with “Tech To Us” just for basic tech support, and they recommend Malwarebytes. It seems to work well on DH’s Win 7 desktop.
“AVG free version”
—
For antivirus it’s good, so is Bitdefender Free Version;
https://www.bitdefender.com/solutions/free.html