hmmm, this is really odd.
I have another test for you if you can be bothered (if it was me I would have just smashed it by now).
download this and run it:
And then post the result.
Try downloading a program called sisoftware Sandra (i think there is a free version) and run the cpu arthemtic benchmark (hopefully you will be able to using the free version).
This test allows you to compare your cpu performance with the same cpu running at optimum speeds, this will let you know whether the cpu is running correctly