Please educate yourself about how to overclock, there are numerous articles and guides that will get you started. Once you run into trouble then the ppl here can give you a hand but READ and don't be LAZY!!!
Read the "how to" below then try some of it out, if you run into specific problems then come back and ask a specific question...
Don't expect the ppl here to write up an entire lesson for you when all you had to do was google "overclock computer"
http://www.overclockersclub.com/overclockingfaq.php