Desktop motherboards incorporate a thermistor to measure the temperature on the CPU. Laptop motherboards generally do not have this capacity, if your laptop does not come with monitoring software I doubt that the motherboard is capable of reading the CPU temperature. If that is the case, the best you can do is to shove a thermometer through the CPU fan vent and measure the temperature of the heatsink. Of course there is a good deal of risk involved in jamming things into the holes on your laptop, so I would not reccommend that you actually do stick a thermometer into your laptop. Basically, you are more than likely S.O.L.
Zenmervolt