Think before upvoting. Report says: "To create a fair testing environment, each product was installed on a clean Windows 7 Home Premium 64-bit target system.

Think before upvoting. Report says: "To create a fair testing environment, each product was installed on a clean Windows 7 Home Premium 64-bit target system. The operating system was updated with Service Pack 1 (SP1), although no later patches or updates were applied." Security Essentials gets definition updates from Windows Update. So, if you don't update your system, you are stuck with what coems with the first install. Windows 7 sp1 was released to public on February 9, 2011. The report is here http://dennistechnologylabs.com/reports/s/a-m/2013/DTL_2013_Q4_Home.1.pdf http://dennistechnologylabs.com/reports/s/a-m/2013/DTL_2013_... and it features such gems as: "Our aim is to test the security product and not the protection provided by keeping systems completely up to date with patches and other mechanisms. Patching will inevitably improve the security of the system and readers are advised to keep all software updated." and "A selection of legitimate but vulnerable software was pre-installed on the target systems. These posed security risks, as they contained known security issues. They included versions of Adobe Flash Player, Adobe Reader and Java."