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support.microsoft.com /en-my /help /17150 /windows-7-what-is-microsoft-security-essentials Microsoft Security Essentials ( MSE ) is a discontinued antivirus software (AV) product that provides protection against different types of malicious software , such as computer viruses , spyware , rootkits , and Trojan horses .
Microsoft subsequently modified the hotfix to prevent installation if an Alureon infection is present, [7] The malware author(s) also fixed the bug in the code. In November 2010, the press reported that the rootkit had evolved to the point that it was bypassing the mandatory kernel-mode driver signing requirement of 64-bit editions of Windows 7.
Upon installation, Microsoft Security Essentials disabled and replaced Windows Defender. [41] [42] In Windows 8, Microsoft upgraded Windows Defender into an antivirus program very similar to Microsoft Security Essentials for Windows 7, [4] and it also uses the same anti-malware engine and virus definitions from MSE.
Microsoft Safety Scanner is a free time-limited virus scan utility similar to the Windows Malicious Software Removal Tool. It is used to scan a system for computer viruses and other forms of malware .
Microsoft Security Essentials detected 89 percent of the rootkit samples. That's good, but more than half of the recent antivirus products detected 100 percent. Microsoft Security Essentials' scores in my malware removal tests were barely average. Many other products, including free products, have shown much greater success.
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