as the person said above me, that's a horrible gfxc.
i suggest going to the nearest tech store around your area and asking them how much would it cost for a decent gfxc and how much it would cost for them to put it in, of course if you don't know how to. if you do know just buy one and install it yourself.
Well I'd recommend a 9800 GT it's like $100 but it's worth it. I have it and it runs MW2, and COD4 fine. COD4 max gfx for 100+fps but that also depends on ram etc. Check the MINIMUM specs for MW2 and maybe get one a bit higher then it.