this was the problem i had, when i starting my pc, this was appearing on my pc's screen. can you tell me, what should be do for this problem.and you should be know one more thing. i couldn't do anything on my pc's, expect this error's appearing.   ERROR(your pc needs to be repaired- the boot configuration data is missing some riquired information. file:/BCD, error code 0xc0000034. you'll need to use the recovery tools on your installation media.if you don't have any installation media(like a disc or usb device), contact your system administrator or pc manufacturer.) Press Esc for UEFl firmware setting. that was the problem.