Not all motherboards are capable of being overclocked.
The motherboard will normally set the FSB and multiplier to the correct settings for the installed CPU.
I assume your CPU is a 333Mhz FSB model hence it is set at 166Mhz in the BIOS.
It would be 200Mhz if the CPU FSB was 400MHz.
Unfortunately what you have posted above does not include what the mobo is.It tells me it is based on the nForce chipset and has a Phoenix BIOS.
What mobo do you have and what processor do you have?