Hi. i am currently trying (to no avail) to under-clock a processor from 200mhz to around 100 mhz. does anybody know what bios menu i have to go to, and what i have to do???
i am splitting hairs!!!!

Just go to your Frequency / voltage control and select Fsb, lower it how ever you like.
If you can find a bois update, it may allow you to access more options such as multiplier, you can lower it to whatever you like.

Please read link carefully to understand it all properly
Download RightMark CPU Clock Utility 2.30.1 - On the fly adjustment of the cpu multiplier, voltage level and more. - Softpedia

CPU multiplier - Wikipedia, the free encyclopedia

i cant find the option in the bios for the voltage/frequency. there is also no mention of the FSB either.
it is a pentium mmx processor if that helps?

Is it a custom built box? Or is a Dell, Hp etc? If so the BIOS are locked in those..

It should be under advanced or system management , you would have to look at every tab.. What type of motherboard is it?

this one?Intel Pentium MMX - The Processor Emporium (UK) - (Page 1 of 2)