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Microsoft Security Essentials Beta

Microsoft Security Essentials Beta 4.8.203.0

Newest version of Microsoft's award-winning no-cost light weight anti-malware service. . Learn what's new on this latest version.

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More about Microsoft Security Essentials Beta

Microsoft Security Essentials is a free download from Microsoft that is simple to install, easy to use, and always kept up to date so you can be assured your PC is protected by the latest technology. It’s easy to tell if your PC is secure — when you’re green, you’re good. It’s that simple.

Your PC must run genuine Windows to install Microsoft Security Essentials. MSE requires Windows 7, Windows Vista, or Windows XP.

There are a host of nasty intruders on the Internet including viruses, trojans, worms and spyware. Microsoft Security Essentials offers award-winning protection against these intruders without getting in your way. Microsoft Security Essentials is built for individuals and small businesses, but it’s based on the same technology that Microsoft uses to protect giant businesses (security products like Microsoft Forefront, the Malicious Software Removal Tool, and Windows Defender). Read more.

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