BSOD Error Code 0xc000021a after attempting to install updates

Where do I even start?
A client of mine came to me with their HP desktop and were saying it could not boot and restore points were not even working. I thought I would have this worked out in no time. I was wrong.

Here is the details for everything:
- Error code is 0X000021a and I can only see it when I, attempt to, boot into Safe Mode (Which all Safe Mode options do not work.)
- Normal booting into the OS results in a mainly blue screen with thin lines and streaks cutting through the screen and nothing is distinguishable.
- I tried System Restore and there is nothing there to access, says Windows.
In this next section, I run commands from the Command Prompt in the Windows Troubleshooting section of the boot.
- SFC scans result in this now: "Windows Resource Protection could not perform the requested operation."
- Chkdsk: Regular Read-Only mode tells me "No further Action is required" and running the extended commands, such as /f /r, takes a huge amount of time and I only did that once. No dice.
- DISM commands seem like such a good idea but I can run only one of them and it does not help me in any way. Say I run "DISM /Online /Cleanup-Image /CheckHealth" it gives me "Deployment Image Servicing and Management Tool. Version 10.0.14393.0.
Error: 50. DISM does not support servicing Windows PE with the /Online option."
And if I try any other DISM commands, more errors, like Error 2.
- System Repair does not work.


I like to fix computers, not just wipe them out and start over. Although, I am at my wits-end here and before I reinstall Windows 10, I figure I would come here first for advice.

Anything is appreciated!

Thanks.

axe0 said:

Download an ISO from this post (Win10PE with preinstalled software that could help troubleshooting) and in the file explorer search for dump files in C:\Windows\Minidump. Copy these files to a different storage device. Then upload the dumps via a working system after zipping the dumps (the site does not support the dump extension)

This is a fantastic tool, thank you for directing me to it!

As far as the Minidumps, I grabbed all of the ones at the system room (Windows, the C drive) and made them into a 7-zip. Would you like to look at them?

Also, while running the PE program, I tried running the DISM commands and I can locate my USB flash drive with Windows 10 installation on it and mount it but then it fails with an "Error: 50" again. Do you want those DISM details as well?

-Edit- Err, turns out I grabbed the temp files but now, there is not such thing as a "Minidump" folder on the hard drive...

The hard drive health is good for now, it appears.

I think something is seriously messed up. After trying more and more commands in the prompt, nothing is working. Ultimately, I decided to "Reset the PC" to make things easier. Well, they aren't. I have this now "Reset this PC. The drive where Windows is installed is locked. Unlock the drive and try again."
What? Is this a BIOS issue, complete corruption of the drive, what could it be now?