Majority agree that Norton is the best anti-virus program. Well, maybe. It does scan deeply and removes most malicious programs. However, it slows down your computer to a crawl and also the system takes ages to boot up. It also interferes with a lot of other programs which are normally non-malicious. Therefore, I prefer AVG anti-virus. The scan time for AVG is almost same as Norton but it doesn’t slow down your computer as much as Norton. And the free edition is as good as the paid version. But it doesn’t have all the features of Norton. And the computer boots up faster with AVG installed compared to Norton. I prefer AVG anyday……