Intel Graphics Media Accelerator 950 IS a Integrated GMA card-
Halo 2 requires either a class 1 or 2 card.
Intel Graphics Media Accelerator 950 is an integrated (onboard) graphic chip on Mobile Intel 945GM chipset. It is a faster clocked version of the GMA 900 and supports no hardware T&L (Transform & Lightning) accelleration (which is required for some games).
You have a Class 5 card.
Low End Graphics Cards - Only older games can be played fluently with these graphics chips (if they were not too demanding). Shared memory graphic cores in this category got the advantage of less heat production and longer battery runtimes. For office, internet, image correction, and video cutting tasks these graphics chips are still useable without any restrictions.