What are the machine specs? Do they meet the 'minimum requirements' listed on the games box or documentation?
Never played Halo but from what I've seen it's a pretty graphic intense, resource hogging game. If the graphics card in there is a MOBO intergrated one or non-TL (
TL ) then fuggedabouit.
If you could post the machine specs I'm sure we'd be able to give ya a better idea.