On August 15 I updated from Windows 7 to Windows 8. I didn't encounter any issues during the installation process and there's been no problems with using the system until today, when I decided to update my BIOS to a newer version. The motherboard I have is ASrock P67 Pro3. The latest update for it was 3.20, released in June 2012. I closed every program before starting to flash bios, but I forgot to run the update as administrator and I had my iPod connected to the PC as it happened. Still, I didn't notice any error messages but as soon as the computer restarted Windows 8 couldn't load. I got a BSOD saying INACCESSIBLE_BOOT_DEVICE. I've tried recovering the system and everything else that the OS allows to do. Nothing's worked. Each time I boot I get the BSOD. What's interesting is that after two BSODs in a row the system automatically lets me pick one of the recovery options and when I launch command prompt I can locate my system drive and all the files on it. In fact, I can even see them in the windows explorer if I choose the option that lets you browse for drivers in the recovery mode. Yet I still can't boot into the system itself. That makes me think something's wrong with the hidden windows partition. I had UEFI enabled when I previously installed Windows 7. Is there anything I can do to be able to use my OS?