"Oh, Cadaver, I know you have beef with nVidia, but they still do lead the Graphics industry, and just because they mess up here and there, don't lead him away, they do sell nice cards (and their on-board is awesome) for not a lot of money. "
Yes, I have a beef with Nvidia. Any company that will cheat its customers does not deserve more customers. Nvidia sold known bad graphics chips, and then sent updates to the fan control, making it run at higher speeds, to ensure the bad chips would last just long enough that the warranty ran out. Google it, they have been sued for it. (And screwed the class in that class action lawsuit, by replacing $600-3000+ laptops with $279 cheapo Compaqs...)
And, were it not for the physics chip, I would say they would be left behind. At the present time, in general, ATI/AMD is more bang for the buck.
I have a beef with HP, too - 3 laptops in a row - all with problems (6100 series: motherboard, memory, wifi, AND the nvidia chip burnout. Compaq [HP owns Compaq] bad keyboard - got that fixed and sold, 9700 series - nvidia card burn.)
But, to reiterate - COREY WILL NOT BE BUYING A NEW SYSTEM - HE WANTS TO UPGRADE WHAT HE HAS TO BETTER IMPROVE HIS GAMING.
Sadly, it looks like he was mislead by the Walmart he bought the system from. Look and see if you can return for full refund (Walmart's return policy is very flexible.)
But, I think this: IF you keep the system - 8 gig of Ram is your best option, as Minecraft is a ram hog. You will not be able to upgrade anything else, except the hard drive - and upgrading to a 7200 rpm drive with larger cache would improve the system's speed.