Download Microsoft Security Essentials 4.1.509.0 Prerelease

Microsoft Security Essentials Prerelease provides real-time protection for your home or small business PC that guards against viruses, spyware, and other malicious software. IT runs quietly and efficiently in the background so you're free to use your Windows-based PC the way you want-without interruptions or long computer wait times.

Microsoft Security Essentials 4.1 (4.1.509.0) Prerelease program allows users to run the latest & greatest versions of Security Essentials before they are publicy available.

As a Microsoft Security Essentials Prerelease user, you will have the opportunity to explore and test new builds of Microsoft Security Essentials before they are publically available and provide feedback to Microsoft. Your feedback helps Microsoft to make its software and services the best that they can be. As a Microsoft Security Essentials Prerelease user, Microsoft Security Essentials updates will automatically be installed on your computer through Microsoft Updates.

To learn more about these programs, see the Microsoft Security Essentials privacy statement at http://go.microsoft.com/fwlink/?linkid=195299.

Leaving the program: If you wish to leave the prerelease program at any point in time, you can do so by uninstalling the program from your computer.

Download Microsoft Security Essentials 4.1 Prerelease
The links in this section correspond to files available for this download. Download the files appropriate for you.
  • MSEPrereleaseInstall_x64_ENU.exe (12.6 MB) Download
  • MSEPrereleaseInstall_x86_ENU.exe (10.3 MB) Download

System requirements:
  • Supported operating systems: Windows 7, Windows Vista, Windows XP

Minimum system requirements for Microsoft Security Essentials
Operating System: Windows XP Service Pack 3 (SP3)*; Windows Vista (Service Pack 1, or Service Pack 2)*; Windows 7*
  • For Windows XP, a PC with a CPU clock speed of 500 MHz or higher, and 256 MB RAM or higher.
  • For Windows Vista and Windows 7, a PC with a CPU clock speed of 1.0 GHz or higher, and 1 GB RAM or higher.
  • VGA display of 800 × 600 or higher.
  • 200 MB of available hard disk space.
  • An Internet connection is required for installation and to download the latest virus and spyware definitions for Microsoft Security Essentials.
  • Internet Browser:

Note: *Your PC must run genuine Windows to install Microsoft Security Essentials.

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