<< If it says laptop, it is running at its lower speed, change it to Home Office/Desk, and that will tell it that you want it to go faster. You do not need to install Speedstep on XP, it is built in. It works great for my Compaq laptop. >>
Thats not quite how it works. when set to Portable/Laptop, Windows XP takes a look at how much you're using your computer (IE, how processor intensive the tasks you are running are), then decideds which speed to run the processor at. So if you were just using microsoft word and listening to an MP3...it would run at the slower of the speeds. If you were crunching SETI WorkUnits and playing Quake III, it would bump the processor up to the faster speed.
The Home Office/Desk setting works more like classic speedstep. It slows down the processor when the AC adapter is unpluged, and it speeds it back up again when it detects the AC adapter again.
The Always on setting turns off speedstep completly