I understand that the Athlon 2000XP runs at 1667Mhz click here
I know for a fact that my XP 2400+ runs at 1995Mhz.
Firstly, your need to set your board and BIOS to the same FSB. You have set your Board to 100 and your BIOS to 133!
Set the Board to 133 as well. It might be 133/166 as it is on my board, and is probably via a 'jumper'.
Then on the page of the BIOS where you set the FSB to 133 (may be called Advanced Chipset Options, but I don't know which BIOS you have) There should be another option to change the multiplier.
That should be set at 12.5 - when you hit Enter there will be, or should be, several options from 9 - 15.
The reason you want 12.5?
Because 12.5*133=1662.5 which is as near to 1667 as you can go without going over or overclocking.