I've been using Panda antivirus for a couple of years and it's very efficient at finding pretty much anything, and getting rid of it. But it all depends what kind of web browsing you do, and how much a better security is worth it (what do you stand to lose if you catch a REALLY nasty one and have to reformat).
Cameras: Canon EOS 6D, Canon EOS Rebel T3i, Canon EOS Rebel T2i, Canon S90
Lenses: Tamron: SP 24-70mm F/2.8 Di VC USD, SP 70-300mm F/4-5.6 Di VC USD, Rokinon: 8mm Fisheye cine, Canon: EF-S 18-55mm f/3.5-5.6 IS Lens, 75-300mm f/4.0-5.6 III, and EF 50mm f/1.8 II
Retired camera: Fujifilm Finepix s700