I can't help you with that but I can help you with your computer. Ok upgrading ram is a great idea

but you have to know who makes and what model is your motherboard. But a typical price for a addition of 256 thus equaling 512 is around 50-60$ go to
Crucial.com for good prices and always buy for a brand name (getting cheap ram is like getting a 333 when you can afford a 777lng

) . Ok hard drives first keep the one you have and get a better one (great piece of advice I know

but I just couldn't help it

) to get one you also incidentally need to know your motherboard make/model. After that it gets complicated but to syick to the basics... if your motherboard has RAID use mode 0 if not then forget about it. Enjoy
