AVG (paid) on all my machines. I think I'm going to stop testing other products altogether - I have been testing products on and off and AVG is the one whose license I have consistently renewed for the last seven or so years. I am, however, giving an eye to Lavasoft Ad-Aware and ZoneAlarm Antivirus, but both have not yet convinced me to switch. I also have a license for eScan, a product I use on and off, for which I have a nostalgic curiosity. I used to use PC Tools Internet Security, but my business with Symantec has pretty much ended the day they decided to discontinue that range of products.