Hard disk drive problem.


Please help!
I have my hp pavilion g series laptop. Before it works well, when I try to open my facebook account on internet it reported an error message saying that my hard disk drive need to install, I canceled it and it goes off. When I try to open it it can't boot from my harddisk, then I use my repair disk to boot and repair startup but my laptop harddisk drive are not there only X drives I have seen. What should I do? Please reply and help me on this. Thank you guys.