Windows 10 Boot Camp BCD Missing/Errors

clean upgrade of Windows 10 from Windows 8.1 Pro (no apps, all updates) using Boot Camp Assistant (latest) on El Capitan
Used EFI install option - no issues install went smoothly
Have latest XCode, etc. installed, all OSX updates installed
Didn't install any Windows updates until after Boot Camp drivers installed (disabled Windows Update until those were complete.)
Win 10 install was clean except for Steam and Chrome installed. No other apps.
Installed all available Windows updates
Today installed latest Windows Updates (not sure what they all were, one was Windows Defender definitions, one was Malicious Software Removal tool, and one was a C++ redistributable update)
Machine rebooted to finish - display was 'off' though - didn't have right dimensions, didn't fill screen, lower res than before updates.
Went into display settings to try to set it back to a higher res
Machine crashed; back into Windows 10 and tried to run the NVidia Control Panel
Crashed again into loop of 3 crashes
Now get blue screen immediately after boot saying "Boot Configuration Data ... missing or contains errors":
When holding down Option at boot no longer see Windows drive either:

Here's output of diskutil - list (I do have a 3TB backup USB drive attached that I did not have attached during Windows install; however, it's worked fine for a week or more and is not used in/by Windows 10):

Here's output of fdisk:

Here's output of sudo gpt -vv -r show /dev/disk0:

When I run diskutil cs list I get, "No CoreStorage logical volume groups found"

Finally, sudo dd if=/dev/rdisk0s4 count=1 2>/dev/null | hexdump -C gives:

Any help appreciated! Not sure what to do next.

MacBook Pro (Retina, 15-inch, Late 2013), OS X El Capitan (10.11.2), null

Posted on Dec 13, 2015 1:15 PM

18 replies

Loner T

Level 9

59,536 points

Dec 17, 2015 12:02 PM in response to hiscapness

hiscapness wrote:

Then the Windows 8.1 logo appears (the white windows logo on the light blue background), followed by a dark blue background with 'Setup is Starting' across the bottom. The system then starts Windows setup.

You cannot use W8.1 to Repair W10. You will need to use BCA to create a W10 installer using a USB and W10 ISO (https://www.microsoft.com/en-us/software-download/home) .

hiscapness Author

Level 1

0 points

Dec 17, 2015 12:26 PM in response to Loner T

Ah, I see. I created the thumb drive and did an in-place upgrade after installing all updates for Win 8.1. Whoops.

I think I'm going to just start over so this doesn't happen again. So, to ensure this, I should:

wipe existing partition
use Disk Utility to create a new partition while still in OSX
reboot with thumb drive in place
reinstall windows using EFI option (using same thumb drive I've already used, this worked fine)
on partition screen, select partition created with Disk Utility
format as NTFS
install

Is this correct? What's the difference using BCA to create the Windows partition vs Disk Utility?

Loner T

Level 9

59,536 points

Dec 17, 2015 12:53 PM in response to hiscapness

BCA will create additional MBR for legacy BIOS OSes like W7, WXP and Vista. It also sets some NVRAM variables.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Windows 10 Boot Camp BCD Missing/Errors