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Check out what you need systems requirements wise to be running to get Microsoft Security Essentials

Minimum system requirements for running 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:

    • Windows Internet Explorer 6.0 or later.

    • Mozilla Firefox 2.0 or later.

  • Microsoft Security Essentials 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.