Master Vivi is right, your problem is likely not a hardware problem. A faster computer running Windows will just manage to crash faster and more efficiently. SDRAM is ancient, yeah. DDR RAM is probably what you want. I've never built a computer from scratch, and honestly I doubt I'd try it. There's too much stuff to worry about. One little mistake and you can fry a couple hundred dollars worth of hardware. My cousin, for example, is a big fan of frying motherboards and burning processors due to not knowing what he's doing. I'd rather pay a few hundred dollars more and know I'm getting something that someone who knows what they're doing has built, and something that is guaranteed to have all its hardware be nice and compatible.