WELCOME TO THE FORUMS!
For starters, go to the front page of this site and click on "tips and techniques" then go to "beginner guides". These will tell you everything you need to know to overclock your computer if it is possible. The guide I recommend starting with is titled OVERCLOCKING BASIC TRAINING. It's a great guide and will show you what to do. Read everything, experiment and when you run into walls and need specific advice on just about anything, post in here in the proper topic and one of the many folks that frequent this place will gladly tell you what they know. Good luck!
Oh, and once you overclock your system, test it's stability by
Folding Proteins.
Good luck!