Security Essentials Screensaver scans for viruses while your computer is idle

  Some people like to display a little eye candy while their computer idles, opting for screensavers which flip through an assortment of photos or flying toasters (for example). Some of us, however, would rather have our system doing meaningful work that we don't want going on while we're using systems. That's why a number of utility apps -- like defrag tools and antivirus programs -- have an