No, you cannot upgrade to that processor. They use different sockets. You could probably fit a GTX 750 in your computer, but you would definitely need more processor to take advantage of it. This is one of those "you can't get there from here" situations. Your best bet would be to buy a pre-built computer. You can find something with comparable specs for about what you can build one for. If you are set on building a computer, that would be a good processor to build around for a low-end gaming system, but you are going to need a new motherboard, and likely some other parts.