When you make a new post, please only hit the submit button once
Check out the Core2 Duo and Core2 Quad overclocking guide, its in the Overclocking section of the forum near the top (its a sticky). Once you've read through that try and think of some specific questions
Edit: amnotanoobie bet me to it, click their link
Would also be useful if you could post up what type of RAM you have e.g. DDR2-667 or DDR2-800, and what you changed when trying to overclock.