Don't mean to be rude or hurt a fellow gamer's feelings but, you're going to be hard pressed trying to play any of the current games with that rig. Heck, I don't even know how you are capable of booting into Win 7 32bit with less that 1GB of Ram... be happy you don't have Vista
My suggestion? if money is tight at the money, save and build yourself a whole new computer, upgrading would be a complete waste of your money.