Controlling PC speed in XP Pro

depends completely on your motherboard, and whether it will let you do that.

for example, i'm running an asus p4b533 motherboard, and a pentium 4 1.6 ghz chip, with the motherboard settings, i've moved up the chip speed to 2.1 ghz. this is what is referred to as "overclocking" your cpu, making it run faster than it had been intended for. you can also slow it down as well. but you need to know what type of motherboard you have, and be VERY knowleagable about what you are doing. setting things wrong can make the system lock up, or even worse, fry your processor