I fejlsikret tilstand (trykke f8 med det samme under opstart) kan du der komme i kommandoprompt, eller får du fejl før du kommer så langt?
Har du prøvet at sætte usb sticken i forskellige porte på computeren?
Nogle accepterer kun boot fra en speciel port har jeg lige læst.
Læste i denne tråd her:
http://think-like-a-computer.com/2012/04/17/boot-bcd-0xc000000f-windows-7/I tråden står et stykke nede:
SOLVED!!! Finally found the solution after many hours. Your guide is perfect and really help me. The problem was that the USB DRIVE was conected to a USB 3.0 port.
Waiting for your answer I still was using Google to find more info and found this...
Not directly related to your issue as you resolved it, but rather to your original description (particularly "The requested system device cannot be found." on BCD operations despite all attempts to recreate/rebuild):
This error can happen if you are booting from a USB stick, and your BIOS supports a given usb slot, but the windows PE/repair environment does not!
I spent two days pulling my hair out, wrestling with this issue (the BCD store was ALWAYS unavailable with this "The requested system device cannot be found." error, no matter what I did), only to find that the problem was simply the USB slot I was plugging my bootable USB stick in. By plugging it into a different (usb 2.0 instead of usb 3.0) slot, the standard repair actions worked fine.
Thanks again ! I completed your instructions after switch the USB to a regular 2.0 port and Windows 7 is back again