I use a free version of Avast antivirus and it’s almost silent in my system. I am under the impression that it’s doing its duty and my PC is free of dangers. But how can I find out if an anti-virus is actually doing its work? I am curious to know if there is a way to find it out. Even though my anti-virus is active in the system it’s not giving any warnings against any suspicious sites. It did not catch any viruses too. May be my computer is clean and the sites I usually visit are safe, but I just wanted to confirm it but how?