In answer to carajean if changing agp arpature size will work on any video card but if the card has to use the system ram instead of the gpu ram then your game will run slower.
I will check on where the setting for integrated video memory is in a second and will update my post then.
Update: The option for uping video memory is called frame buffer in my bios and I am guessing it will be the same in your computer. It is listed under advanced chipset features. (I believe that is the name)