Rather than retyping the entire list I will just include a link to the page which contains a pretty comprehensive summary of antivirus products available to date. The symbols in the left hand column of the Matousec list indicate:- 1) Antivirus manufacturers favicon. 2) 64 bit version availability. 3,4,5,6 ,7,8) Microsoft operating system compatibility. 9) Download availability. 10) Availability of free version. (Click on the matousec logo to view their up to date list).
Matousec also perform a series of independent tests on a selection of these products, it may be worth your while checking this test list periodically to see which antivirus product is performing the best.