Ok, you need to learn something about CPU's.
A: They don't use drivers.
B: You can overclock ANY processor in any computer THAT ISN'T from the name brands, so you need to get a custom, or build a computer before you can surely overclock it.
C: Overclocking is mostly found and done in the BIOS, just look for "FSB multipliers" and things.
D: Otherwise, you can use overclocking programs. I reccomend ClockGen
for easy overclocking.
E: Research as much about overclocking as you wan to before you begin, it can kill your CPU.
F: Make sure you have proper cooling in your system before you attemp a big overclock (pretty much anything over 300MHz). Proper cooling is usually 4 fans, 2 in back, one on CPU, and one on your Power Supply.
Other than that, look in your BIOS for options, and if you can;t find any, download the proper version of nForce for you. I suggest that is your motherboard is from late 2004 and up, it should be an nForce4.