New Microsoft Security Essentials Beta now public

Posted by bink on November 30 2011, 1:57 AM.

Version: 4.0.1111.0

The Beta program is a fully functional antimalware app with ongoing updates to help protect your PC from viruses, spyware, and other malicious software. In addition to ongoing virus and spyware definition updates, we’ll provide software updates to the Beta for download through Microsoft Update on a periodic basis. To have these updates installed automatically, you must be subscribed to Microsoft Update with preferences set to Automatically download and install new updates.


This Beta version of Microsoft Security Essentials includes the following new features and enhancements to better help protect your PC from threats:

  • Enhanced protection through automatic malware remediation: The Beta program will clean highly impacting malware infections automatically, with no required user interaction.

  • Enhanced performance: The Beta includes many performance improvements to make sure your PC performance isn’t compromised.

  • Simplified UI – Simplified UI makes Microsoft Security Essentials Beta easier to use.

  • New and improved protection engine: The updated engine offers enhanced detection with cleanup capabilities and better performance.

System Requirements:

Operating System: Windows XP Service Pack 3 (SP3)*; Windows Vista (Service Pack 1, or Service Pack 2)*; Windows 7 (Service Pack 1)*

  • 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 Beta.

  • Internet Browser:

    • Windows Internet Explorer 6.0 or later.

    • Mozilla Firefox 2.0 or later.

  • Microsoft Security Essentials Beta also supports Windows XP Mode in Windows 7. For more information see the system requirements for Windows XP Mode in Windows 7.

  • *Your PC must run genuine Windows to install Microsoft Security Essentials Beta. Learn more about genuine Windows.

Download Microsoft Security Essentials Public Beta