text: No.  There's no substitute for a quality anti-virus and spyware protector that you manage yourself.  If you're looking for a good FREE program of each variety, try Anti-Vir (http://www.free-av.com/) and Spybot (http://www.safer-networking.org/en/download/).  There's nothing wrong with online scanners, per se; however, having a dependable, locally installed line of defense is always your best bet.