Most laptops are like that. Generally, laptops aren't designed to handle the extra heat associated with CPU overclocking. There are a couple of programs that can do it without the BIOS, but they aren't as reliable or stable. I'm actually drawing a blank on the name of the one program I've used. If I remember what it is, I will post back.
edit: It was Clockgen from CPUID. They don't officially support it any more though.