 In October 2009 , AV @-@ TEST conducted a series of trials on the final build of the product in which it detected and caught 98 @.@ 44 percent of 545 @,@ 034 computer viruses , computer worms and software Trojan horses as well as 90 @.@ 95 percent of 14 @,@ 222 spyware and adware samples . It also detected and eliminated all 25 tested rootkits , generating no false @-@ positives . Between June 2010 to January 2013 , AV @-@ TEST tested Microsoft Security Essentials 14 times ; in 11 out of 14 cases , MSE secured AV @-@ TEST certification of outperforming AV industry average ratings . Microsoft Security Essentials 2 @.@ 0 was tested and certified on March 2011 . The product achieved a protection score of 2 @.@ 5 out of 6 , a repair score of 3 @.@ 5 out of 6 and a usability score of 5 @.@ 5 out of 6 . Report details show that although version 2 @.@ 0 was able to find all malware samples of the <unk> ( widespread malware ) , it was not able to stop all Internet @-@ based attacks because it lacks personal firewall and anti @-@ spam capabilities . In an April 2012 test , version 2 @.@ 1 achieved scores of 3 @.@ 0 , 5 @.@ 5 and 5 @.@ 0 for protection , repair and usability . Version 4 @.@ 0 for Windows 7 <unk> ( x64 ) was tested in June 2012 and achieved scores of 2 @.@ 5 , 5 @.@ 5 and 5 @.@ 5 for protection , repair and usability . In October 2012 , the product lost its AV @-@ TEST certification when Microsoft Security Essentials 4 @.@ 1 achieved scores of 1 @.@ 5 , 3 @.@ 5 and 5 @.@ 5 for its protection , repair and usability . 
