I will be doing something and then i get an error message that says windows is shutting down to prevent damage to windows(it also makes a funny sound{inside of the computer} like ,....a clicking sound or like something is trying to start but cant)......but then when I reboot the computer and it says ----primary hard disk drive 0 not found, No bootable devices-strike F1 to retry boot, F2 for setup utility---- i dont know whats wrong.......any suggestions