klipton said:
Half-life is his favourite game, but he also liked portal, metal gear solid, and The Ball.
He has good taste.
Does he have access to any other consoles? A PS2/3 or a Wii maybe?
If not, than I would recommend he try Morrowind, big PC game, simple to run, good training for Skyrim (for when he gets a better PC) The original Deus Ex and Painkiller where already mentioned, so I'll re-iderate them. I don't know if Minecraft will run on that card, but I'll mention it anyway. If he can run Portal than he can run TF2, it's free to play now so he may as well give that a shot. While we're talking online FPSes, he might enjoy Counter Strike (and by extension CSS). If he likes 2D platformers, than I would HIGHLY recommend VVVVVV, single best inde game I have ever played. Also, Hitman Blood Money is 75% off today on Steam, very good game, highly recommended
That should get ya started.