Windows updates KB4512506, KB4474419, KB890830 fail to install on a W

I have read the Windows update Posting Instructions. I am trying to follow the instructions.


I have six computers running Windows 7 Pro. Updates to Windows were applied last night. Five computes updated successfully. The sixth computer failed to update. I tried updating several times. Each time the updates were applied the computer would not reboot properly. When rebooting the message “Windows is loading files” would appear. Then a System recovery option screen appears. It asked me for the type of keyboard ; I accepted the default which was US. Then the recovery process halted with the message:
The digital signature of file Winload.efi cannot be verified.


No error codes are displayed.
I cannot collect Windows logs because Windows will not let me get to a command prompt so I can collect log files.


Each time Windows applies updates it creates a restore point. I tried to boot to safe mode by pressing F8 so I could get to the restore point. The computer ignored my attempts to do this. I finally had to restore the entire C drive using last night’s backup.


I have searched through Seven forum for answers to this problem. Most of them are at least a year old or older.


Questions:
Q1.) How do I solve this problem?
Q2.) The updates which I tried to install are KB4512506, KB4474419, KB890830. Which one is causing this problem?

Try installing KB4474419 only first and restart computer, then install other two which worked for me on a 64bit unit with Win 7 Pro.


See this also, it's what I keyed on:

NoN said:

Mine installed first KB4474419 with a failed KB4512506 because both were checked...after rebooting fine, it had install the failed one, rebooted fine, then installed the others fine.

Thank you for the suggestion. I will try this as soon as possible.

If your computer is blocked in Startup Repair and you can't repair with restore point, there is a good solution.

Start your computer on USB Key with iso of Windows (W7 or W10)

Go to repair your computer > Troubleshoot > command prompt

In the command prompt:
Use the command
bcdboot c:\windows /l en-us

Restart your computer and it's solved


You can now install last KB4474419
https://support.microsoft.com/en-us/...support-update

Thank you, VincetVV for the tip. I will try this.