I have read in other threads that having, updating and running an AV programme is pretty much a waste of time. The bad points being that such progs tend to hog system resources and are only of any use in a mixed OS system where windows is used as well as Mac. I can't argue with that, nor would I wish to. At the same time, I can't seem to make myself accept that I don't need an AV prog. I guess it's all down to the 12 - 14 years of using windows based PCs. Anyway, it was brought home to me tonight when I first considered using a torrent website but here's the thing. Would it be technically possible to install an AV prog such as AVG that didn't run all the time in the background but could be updated at the user's choice of time and ONLY check software for issues as and when the user clicks a button. When I say "Technically possible", what I actually mean is can it be done from a user's point of view. In Windows, I could just Right Click and see an option there to "Scan with AVG". Can I do that with a Mac?