First off, he has Intel integrated graphics which aren't made for gaming at all. That is probably his biggest problem.
Secondly, the processor is a bit lacking however, that seems like the older motherboard socket, and the upgrades for the processor on it are very limited, and probably not worth upgrading.
I just looked up the system requirements, and that game isn't very demanding. For now, tell him to go into the graphics options for the game and turn them down lower. This should help a bit. If you want to get a graphics card for him (you could probably get a cheap one if he's only playing that game) let us know and we can help you find one. We'll need to know the motherboard model, or the make and model of the computer.
Upgrading the ram may help too, but I don't think it would be causing too much of a problem for this game. Make sure the computer doesn't have a lot of programs running in the background (you can check this under the processes tab in task manager). Also, make sure he doesn't have any viruses or other malware on the computer.
Edited by Sterling14, 17 March 2009 - 06:49 PM.
"I think there is a world market for maybe five computers." - Thomas Watson, Chairman of IBM, 1943