Should do, you have a similar spec to my laptop but with a much better gfx card. You may have issues with win7 though (same issues with vista too).
My spec is Core2duo 2*2GHz / 3Gb Ram / 250Gb HDD / Intel4500MHD gfx card (dx10) / Vista... with this spec the game runs at 60fps (vsync enabled) in open ocean, in port or near a large convoy it drops to 30-40fps.
In short youve got more than enough to run sh3,youll be fine
