The processor isn't terrible. If he got a new processor he'd need a new motherboard since he has an LGA 775 socket. Really with such an old motherboard, you can spend 100 -200 on a new graphics card for a small fix. But if you sink 500 you could build basically a new computer and dramatically improve your performance. That 755 socket will hold you back from any real performance increase. I'd recommend saving money for a few more months and building a entry level gaming PC for ~$500 that will let you play most anything you want.