1. Your BIOS is probably locked so your OCing options are out as it is an OEM motherboard.
2. Read the C2D/C2Q Overclocking sticky at the top of the Overclocking section.
3. You have an Elitegroup motherboard. They are not the best boards to overclock on any ways. It's also an old chipset (IIRC it should be a 630i?).