How to fix hard disk

Please elaborate on your problem and describe why you think it is related to the hard disk. What is wrong with your current hard disk? If you are looking for a simple replacement guide, see this generic hard disk drive replacement guide: Remplacement du disque dur d'un ordinateur de bureau

I can provide further instructions and assistance if you give me more information on your problem, it's symptoms, what may be causing it (if known), and what other parts are in your computer.