📎 AI Summary:
The thread discusses a Windows 8.1 user experiencing boot issues after failed Windows 10 upgrade, with errors like 0xc0000034 and boot files misconfigured to favor USB media, requiring USB for startup. The user has attempted fixes like command prompt recovery commands, which are complicated by the boot environment referencing the wrong drive. A responder suggests trying a specific fix for boot configuration errors and recommends backing up data followed by a clean Windows installation if issues persist.

klelund

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I have had some problems with my windows 8.1 installation. It all started when I tried to update to windows 10. It failed and if I remember correctly my computer showed blue screen of death when I restarted it afterwards. Pretty sure the error code was 0xc0000034. I tried a lot of things to restore the boot files and somehow I think I have managed to have the windows installation use the boot files on my USB installation media instead of the original from drive C, where my windows 8.1 installation is found. I can only start windows with the usb inserted and when secure boot is disabled in BIOS legacy only is used.

I can't even reset windows with or without the USB installation media inserted.

I am very confused on how to proceed to fix the problem or make a clean installation (if I boot from the usb installation media, I just start windows as the boot files from the usb is used to boot windows).

I am not sure on what to elaborate, so please ask if you need any more information on the problem I am experiencing.

By the way - going to command prompt and trying to /fixmbr /fixboot etc. does not work, as it uses the directory X:\windows\system32> instead of the C: drive where windows is installed. I have probably made this change myself some weeks ago, trying to fix the 0xc0000034 error