Sounds to me like a number of things Nick...
From your previous posts, I would agree that it uses on board graphics chipset on the motherboard. This then shares the system memory (the 4GB you just upgraded to). If your running Vista, then this should be the minimum memory needed to run it! Nowadays, DELL stuff isn't proprietry (sp?) since tech peeps like myself complained bitterly about it.
IMO I would always try software stuff first, before splashing out on hardware.
New graphics cards also tend to need extra power through a molex connector, which from the sounds of it, your power supply cannot provide, since it is only 250W (you need really about 400w nowadays to do anything more than basic surfing/word docs/email etc....)
Rich D has made the most sense if you HAVE to play the game, buy a new tower, but if your not bothered that much, just get one of the new PS3 slim's! I gave up years ago buying PC games, because of the constant upgrade, driver, directX etc etc issues, which just became a PITA!
HTH (a bit!)
M.
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