I use Avast on most of my PCs. In particular I like the option to set AVAST as the screensaver so that when it kicks on it scans the computer, lot easier to get people to run a Virus scan if you just tell them to walk away from the computer and leave it on. The former method of setting up a schedule usually resulted in the PC not being on when scheduled or "I was in the middle of something so I canceled it", thus never running it.