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Windows Defender: System Requirements

Minimum system requirements for Windows Defender:

  • Personal computer with an Intel Pentium 233-megahertz (MHz) or higher processor; Pentium III recommended.

  • Operating system: Windows Vista, Windows XP Service Pack 2 or later, or Windows Server 2003 Service Pack 1 or later.

  • 64 megabytes (MB) of RAM (minimum); 128 MB RAM (recommended).

  • 20 MB of available hard disk space.

  • Microsoft Internet Explorer 6.0 or later.

  • Internet access with at least a 28.8 Kbps connection.

  • Windows Installer version 3.1 or higher. Visit the Microsoft Download Center to download the installer.

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