Many here recommend the built in antivirus. I use it on my tablet and it seems to do a good job. I use Avast on my main browsing PC.. it's also effective and has a good pro-active web component to protect me while browsing and I use Bitdefender on my media server but the latest version uses lots of RAM so I don't use it on my main PC... it's also very good from my experience.

I spent a lot of time trying a/v's out over the last year and my current fav is Avast but note that it tries to up-sell itself a lot with popups trying to get you to upgrade. At least once per day. A bit annoying but it is free. It also uses less RAM than any other I've tried. I used Sophos for a while but their latest upgrade last year made it very difficult to deal with.. it's GUI was on line and was quite unwieldy to deal with after you logged in with your browser.

As far as popups go I'm not aware of any a/v that deals with them directly at all. I use the browser's built in popup blocker and uBlock origin ad blocker to assist. There are other add-ons for that as well but I've never tried one... it's never been a big enough problem to look into it. Some a/v's do have additional browser add-ons that may or may not be part of the main package but I have never used any (other than Malwarebytes' addon which does not block popups per se).