CPU won't go over 1.2GHz in Windows 8.1
I installed windows 8.1 on an early 2008 macbook pro 2.4ghz penryn core 2 duo and the first things I do is run diagnostics, I opened cpu-z and task manager and they both show the cpu is at 1.2ghz. This is even when it's plugged in and the power options on high performance, I even tried loading it with prime and it stays at 1.2ghz no matter what and cpu-z says it's always on the x6 multiplier and never goes to full x12. The fsb stayed at 200mhz though, and when I tried loading it with passmark I only got a meager 900 points in the cpu test no matter how many times I tried running it and even with no other programs running, this proves that the cpu is running way under it's normal operating 2.4ghz speed. Can anyone with knowledge on how to solve this help me?