The Microsoft Security Essentials application provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.

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.

Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you want - without interruptions or long computer wait times. 

Download Microsoft Security Essentials 4.1.522.0
Key features of "Microsoft Security Essentials":
  • Comprehensive malware protection
  • Simple, free download
  • Automatic updates
  • Easy to use

Requirements:
  • For XP - CPU with clock speed of 500 MHz or higher
  • For XP - Memory: 256 MB RAM or higher
  • For Vista / W7 - CPU with clock speed of 1.0 GHz or higher
  • For Vista / W7 - Memory: 1 GB RAM or higher
  • VGA (Display): 800 x 600 or higher
  • Storage: 140 MB of available hard-disk space
  • An Internet connection is required for installation and to download the latest virus and spyware definitions for Microsoft Microsoft Security Essentials
  • Internet Browser (IE or Firefox)

What's New in This Release:
  • 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.
Download Microsoft Security Essentials 4.1.522.0  -  x86
Download Microsoft Security Essentials 4.1.522.0  -  x64