I really doubt it's due to compatibility, since he did claim that the program worked fine initially.
Since this is a laptop, and you have such a power-demanding processor in there, there's going to be a ton of heat. After a certain extent, the CPU automatically recognizes that the fan isn't doing enough, so it decreases the clock speed to try to allow the processor to cool a little. However, since you also have that graphics card in there, that doesn't happen so easily, so it stays at that low clock speed, and only decreases as time progresses.
Do what I did and simply use a lower power mode so the graphics card and processor don't overheat and make the processor start slowing itself down.
If you want, go get HWMonitor and start it...