Heres a link for going to CMOS
http://http://www.computerhope.com/issues/ch000192.htm
And here's one for resetting the CMOS
http://http://www.computerhope.com/issues/ch000976.htm
I think you mean CPU by the way. Did you put in any new hardware? Like added RAM or a new video card? Or maybe even a CD or DVD drive?
Also take note that it seems like you need to push the "delete" key to go to these setting on your computer. F1 is normally what you'd have to push to have the computer set up any new hardware you may have put into your computer like the things listed above.
If you did put in new hardware, it may not be compatible with your CPU (motherboard).