Symantec Norton AntiVirus 2011 took home the top prize with its excellent malware detection, blocking, and cleanup. Paid antivirus usually comes with better technical support options and more-comprehensive protection features than free programs. More and more antivirus packages come with tie-ins to so-called cloud services, in which fresh information on brand-new threats pushes down from vendor’s Web servers to your PC. BitDefender Antivirus Pro 2011 and G-Data AntiVirirus 2011 round out the top three.”]
Source: https://www.csoonline.com/article/2126660/antivirus-2011–digital-defenders.html