Microsoft’s Security Essentials (MSE) most likely to run protection using optimal settings, OPSWAT survey finds. MSE users were also the best at updating frequency, with 94 percent updating in the previous week. Kaspersky Lab’s Internet Security users only activated this important setting 65.5 percent of the time, with Norton Internet Security and Norton AntiVirus users not much better than Avast, McAfee and Avira users. The most popular antivirus program in the US with 25.3 percent market share.”]