No, I'm afraid it isn't possible. The 3200 is an integrated (part of Northbridge) but even if it were a discrete laptop chip, often they are attached in (and you can't get the parts anyway). So, unfortunately no.
No. You would have to replace the motherboard and there are only a few, if there are any at all, that would fit inside that casing. Basically if Gateway offers that same laptop with a dedicated GPU, then you would have to find out what model number that is and get the motherboard, as well as the cooling solution, for that model. You would need to take the entire laptop apart, replace the parts, and put it all back together carefully without breaking any of those darn little parts.