TheComputerPro, have you actually read the sticky about overclocking in this forum? You need to watch your temperature for one thing, if it get's too hot then it could cause some damage. You can't just ask people if putting your CPU multiplier at 20 is a good idea because every computer is different. Increasing the FSB is a much better idea, but you'll have to figure out how far to go yourself.
By the way, you will never be able to get your computer to go 20 times faster. The most you can hope to achieve under normal circumstances is about 20% more performance.
And if you fry your CPU, then no it will never work again.