error 0xc0000428 winload.exe cannot be verified

Slartybart said:

Good find, I think you're on the right track.

Paraphrasing SIW's post:

Use bcdboot, it is on the Win7 install DVD
Boot up the Win7 install DVD
Select Command prompt

enter the following commands (*** are comments, not part of the command):

diskpart
lis vol *** identify the drive letters for the Win7 Boot partition and the active System partition
*** ----> the letters are probably be different in Diskpart
exit

bcdboot <driveLetter-Win7 Boot>: /s <driveLetter-active System>:

Let's say that Diskpart tells you

J: is your Win7 Boot drive letter
H: is you active System drive letter
These drive letters (J and H) are only for examples - your letters will be different.

The command to use would be:

bcdboot J: /s H:

There might be another set of commands to run if this doesn't resolve the issue, but start with this.

failure when attempting to copy boot files.

homehome said:

failure when attempting to copy boot files.

That was the entire message?

In the mean time, try this:
Settings > Update & ... > Recovery > Advanced Startup

Select trouble shoot from the options presented
then select advanced options
and finally, select Startup Repair

Depending on what needs to be repaired, Windows might stage the repairs.
If the first attempt does not resolve the issue, run the same procedure again
If the second attempt does not resolve the issue, run the same procedure a third and final time

Let me think about the issue a bit more ... if the above does not help, I'm running out of ideas.
Other members might stop by and offer their advice.

I just experienced error Status 0xc0000428, "Windows cannot verify the digital signature for this file", when booting a cloned Windows 10 partition on a computer that is setup to dual boot that system and an older Windows 7 system (where the older Windows 7 system boots without error). The c0000428 error is generated by the Active partition's bootmgr file when it does not recognize the digital signature of the winload.exe file in the newer Windows 10 system.

To correct the problem, replace the bootmgr file in the Active partition with a newer one. In my case that would be replacing it with a Windows 10 one, which I was able to copy from the Windows 10 partition to the Active partition. In an Administrator or repair Command Prompt, I was able to use the "xcopy e:\bootmgr c:\ /h" command to copy the hidden bootmgr file where e: was the Windows 10 partition and c: is the Active boot partition.