I'm comfortable with Avast Secure Anywhere. I get it every year on sale at Newegg. (5 machine license)It has low system resource usage and scans fast. Along with Avast i am using Malwarebytes too.No infections here for years, except for when a hormonal grandson stayed with us for a week and choked-out the guest PC with Elizabeth Hurley downloads.He had to turn-off Avast to get them and he knew just how to do that. Restored the PC with an image file and all was good again.