I use AVG. It's a freebee. And I run Malwarebytes and CCleaner.
I also use AVG, Malwarebytes, and CCleaner, and I've never had a problem.
I use
Spybot Search & destroy, and AVG Free edition
both programs work great and are both free.
I don't use any. Too much of a resource hog and it slows down the computer. I do backups and make sure I have all the security updates from microsoft I do have the free AVG on an old computer and will move a drive over to it if I think it is infected. I will also run the housecall web antivirus if I think I have an antivirus.