System Requirements of Halo 2:
OS: Windows Vista for Halo 2
Processor: 2 Ghz Pentium 4 class processor (or x64) for Halo 2
RAM: 1 GB for Halo 2
Hard Drive: 7 GB for Halo 2
Video Card: DX9 graphics card: WDDM driver, PS 2.0/32BPP, At least nVidia 6000 or ATI x700 or above for Halo 2
Online Multi-player: Internet connection for Games for Windows – LIVE for Halo 2
Drive: DVD-ROM drive for Halo 2