First off at the back off the game it will say right at the bottom of the case the specifications of the graphics card required, it usually has a few to choose write them down on a piece of paper, also check the processor is up to specification as well because there is no point buying a decent graphics card if your computer cant take the pace, if the processor is not good enough then I am afraid you need a new computer and you can forget about the graphics card.
To check your processor speed click on the the system tab on the control panel in windows.
If you pass that you now need a little look in your case to see if you can actually add a graphics card, unplugging EVERYTHING THAT IS attached to the case and everything that’s plugged in to the MAINS ELECTRICITY, make a little note of where everything goes back to before disconnecting :-)
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With everything unplugged take the two little screws out of the side panel on your case, where your monitor cable connects to your computer you should see a card behind it slotted in to an expansion bay, it will probably be secure with a little plastic clip to your mother board and a small screw to the case, unscrew the screw and release the clip it should now slot out the expansion slot.
Now this graphics card could be AGP or PCI EXPRESS, best to take the said card with you to Aria or Microdirect,with the piece of paper with the specifications of the one you need to play the game,ask the lad on customer services what type it is and advice on a budget card (cheapest available),hopefully they will sort you out.
Armed with the new card go home return it to the old cards slot, put the drivers in the CDRom and your son will be happy.
(I hope)
