Recently when I went to log on to my older but still working computer, I received the following error message.
UNMOUNTABLE_BOOT_VOLUME

Technical infomation:
STOP:0x000000ED
(0x80E6A838, 0xC0000032,0x00000000,0x00000000)

I cannot start in safe mode, I cannot startup with "last known good configuration"

My daughter was on just before this. She was downloading some pictures from her digital camera to her desktop. Nothing unusual??

Any help or advice would be greatly appreciated