Hey PC Guys (and Gals if you exist

),
I only play on the PS3, but I'm a web administrator and I get bored at work,

, so I downloaded a copy of COD4 for PC and I get this error:
Error during initialization:
Video card or driver doesn't support UBYTE4N vertex data.
Now I am well aware that it is because my graphics card (on board video) is nowhere near powerful enough, but my computer is quite powerful; 3 GHz Duo core processor, 2 gigs of RAM, and 80 GB HD (although pretty much full of crap

), so I should be able to run it provided I had the graphics (which by the way is one of those up to 256 or 512 MB of video bull sh*t type chips).
My question is, is there any way to get around this graphics issue? Any settings or patch or something that I can apply that could get me around this issue. I'm aware the game certainly would not be running at good quality or anything, but I'd like to try if possible.