times - The interloper made extreme sense.
As to the "best" free antivirus, no product is perfect and I wouldn't pick any as the "best". Everything depends on a combination of the product, the status of computer updates and also the computer operator's surfing habits. The only free antivirus I've used in a number of years is Microsoft Security Essentials. ESET is the only paid/licensed antivirus I've used. I've never had a virus or trojan on any of my computers whether with the free product or licensed product.