Recent articles on Wired indicate that experts are saying that even the best antivirus programs are easily exploited. I've taken to using my older computer with Linux to 'do' the internet. It has nothing important on it. My good one (with all my graphics programs) never goes online and I share the monitors, keyboard and mouse with an inexpensive KVM switch. While there are a few viruses for Linux, it's not a target like the popular OS's. It's immune to the recent rash of ransomware and if something does go bad, I can reload it in a few minutes from a backup on a USB stick.