I actually have a version of free avast that was downloaded for me last year, by a computer tech, which does a scan of my computer, about 30,000 files or so, every time my computer goes into screensaver. If it finds any viruses it removes them, and then does a rescan, until the computer is deemed clean. I'm very satisfied with it. It is much better than Norton, the antivirus protection I had previously. I got an adware virus when I was using Norton.

Hope that helps.

Mitch