djaburg

I guess perhaps I'm not understanding what it is you're looking for. You state that you want "pretty much a full computer update designed for windows xp", yet you don't want to replace the motherboard. The only real option other than a new motherboard/cpu, would be to upgrade the CPU itself, but if the motherboard is old then you'd most likely only gain a few hundred Mhz in speed since you could only use an outdated CPU on the old motherboard in your machine. If we try it another way, what is it you're hoping to achieve? More speed for gaming? Better video? More HD space?

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Computers make it easier to do a lot of things, but most of the things they make it easier to do don't need to be done.
Andy Rooney