Microsoft Security Essentials – MSSECES.EXE
Msseces.exe, msmpeng.exe, and mpcmdrun.exe install with Microsoft Security Essentials. This free utility that promises real-time protection for your home PC that guards against viruses, spyware, and other malicious software. If you want this program to provide real-time protection, it will need to be running all the time. So leave them in your Startup Programs, Services and scheduled tasks. You'll find more information at http://www.microsoft.com/security_essentials/.
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Microsoft