Minimum system requirements for Windows Defender: Personal computer with an Intel Pentium 233-megahertz (MHz) or higher processor; Pentium III recommended. Operating system: 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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