My vote goes with AVG,, I have set it up on NUMEROUS machines of all flavours,, and it has identified everything!!
It is Lite,, FREE,, and Works,, plus it has pretty colours,,
what more can you ask for,,
PS<< STAY AWAY FROM MCAFEE!!! IT IS GARBAGE! - kills your machine,, interferes with memory,, slows everything down,,and does NOT catch everything,,
How can I say this?? Because at my place of employment that is the antivirus that we use,, and it is Crap!! Dont even begin to talk about their EPOS venture,, its a nightmare!
cheers,,
I need a drink now,,