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