Microsoft Security Essentials (MSE) is a free antivirus software product created byMicrosoft that provides protection against different types of malware such ascomputer virus, spyware, rootkits and trojan horses for Windows XP (x86),Windows Vista, and Windows 7 (both x86 and x64). Microsoft Security Essentials replaces Windows Live OneCare, a commercial subscription-based antivirus service and the free Windows Defender, which only protected users fromadware and spyware. Unlike the Microsoft Forefront family of enterprise-oriented security products, Microsoft Security Essentials is geared for consumer use.
Microsoft Security Essentials received positive reviews upon its release.
In February 2010, a rogue security software package calling itself "Security Essentials 2010" appeared on the Internet. This malware, designated TrojanDownloader:Win32/Fakeinit, bears no resemblance to Microsoft Security Essentials except for the name. This malware reappeared again in November 2010, this time calling itself "Microsoft Security Essentials 2011".
A more dangerous form of these malware rogues however, appeared in October 2010. This malware, designated Rogue:Win32/FakePAV, closely resembles Microsoft Security Essentials in look and uses sophisticated social engineering to compel users into introducing malware to their systems, under the guise of five different fictional anti-malware products. This malware also terminates and prevents the launch of 156 different programs, including but not limited to Registry Editor, Command Prompt, Internet Explorer, Mozilla Firefox, Opera, Safari, Google Chrome and other web browsers, email clients, instant messaging clients, media players and entertainment software.
source : en.wikipedia.
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