Minimum system requirements
Operating System: Microsoft Windows 98, Microsoft Windows Second Edition, Microsoft Windows Millennium Edition (Me), Microsoft Windows 2000, or Microsoft Windows XP.
Computer/Processor: 733 megahertz (MHz) processor.DirectX: DirectX® 9.0 or later. (DirectX 9.0b is installed by Halo.)
Memory: 128 megabytes (MB) of RAM.
Hard Disk: 1.2 gigabytes (GB) of free hard disk space.
Video card: 32 MB with 3D Transform and Lighting capable.
http://btjunkie.org/torrent/Halo-Combat-Evolved-PC-ENG/3587a191c1b5e18ca200226cafe7bdd68769097f874a
