It replaces Windows Live One Care, a discontinued commercial subscription-based AV service, and the free Windows Defender, which until Windows 8 protected users from only adware and spyware.

Built upon the same virus definitions and scanning engine as other Microsoft antivirus products, MSE provides real-time protection, constantly monitoring activities on the computer and scanning new files as they are downloaded or created and disabling detected threats.

Norton Internet Security, developed by Symantec Corporation, is a computer program that provides malware prevention and removal during a subscription period and uses signatures and heuristics to identify viruses.

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Existing users of the 2006 and newer versions can upgrade to the latest version of the Norton software without buying a new subscription.

The upgraded product retains the same number of days left on a user's subscription.

Put together an anti-virus update, new-fangled encryption technology and a 11-year-old operating system, and what do you get?

Security giant Symantec admitted Friday (July 13) that updates pushed out to several of its software products two days earlier had caused computers running Windows XP to crash and display the dreaded "Blue Screen of Death." "On July 11th, 2012 Symantec Security Response started receiving reports of customers experiencing blue screens after applying the July 11th revision 18 definitions," wrote Orla Cox of Symantec Security Response in a blog posting.

The security software could then block Internet access and/or installation.

To prevent or resolve this conflicts: Most firewalls ask you for permission when an "unknown" program attempts to connect to the Internet.Norton Internet Security held a 61% market share in the United States retail security suite category in the first half of 2007.In this study, competitors, in terms of market share, included security suites from CA, Inc., Trend Micro, and Kaspersky Lab."After a full evaluation and root cause analysis of the issue, we have determined that the issue was limited to machines running a combination of Windows XP, the latest version of the SONAR technology, the July 11th rev11 SONAR signature set, and certain third-party software," Cox later wrote.Cox did not identify the third-party software, but in the discussion forum attached to her posting, a Symantec employee explained that the conflict was with various kinds of whole-disk-encryption software.English, Bulgarian, Chinese (Simplified), Chinese (Traditional), Croatian, Czech, Danish, Dutch, Estonian, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Korean, Latvian, Lithuanian, Norwegian, Polish, Portuguese (Brazilian), Portuguese (Portugal), Romanian, Russian, Serbian (Latin), Slovak, Spanish, Swedish, Thai, Turkish, Ukrainian and Vietnamese Microsoft Security Essentials (MSE) is an antivirus software (AV) product that provides protection against different types of malicious software such as computer viruses, spyware, rootkits and Trojan horses.