Stablizing my system..

I seem to be having trouble finding the step by step guides Mr. Garibaldi mentioned. I'd rather not post and have everyone else solve my problems instantly, but if someone could point me to one such guide I could learn from, I'd be most appreciative. I've had to knock back the internal clock now to 142 MHz, which is a little more stable. I'm fairly confident I should be able to go a little bit higher than that though. I can't afford a new CPU at the momentd, so I'd rather not physically mod the hardware!