I have Intel Core 2 Duo 2.93 GHz, 4GB DDR3 RAM, Intel G41 On-Board Graphics Card. Can I run GTA IV?
Yes, but at the frames you'd be getting it's not even worth trying. This guy is playing at the lowest setting possible on a resolution of 800x600 with the same GPU chipset as you and a very similarly equivalent processor. This video may seem smooth, but in reality it's much choppier. You can even see how bad the microstuttering is. The GTA IV benchmark concluded that his framerate was a mere 16 fps. Considering that, it's really not worth installing until you get a new rig: