help after automatic update restart now BSOD error BSOD with error message 0xc000021a stuck in loop

[Bruceyfamily]

My laptop is running Windows 10 and after an automatic update restart I now have a blue screen and error message 0xc000021a. Tried auto repair and a reset and system restore but they have all failed. Now stuck in a crashing loop. Also tried to boot in safe mode and this has failed.

Tried all the suggestions on microsofts help page and now wish I never allowed it to restart.

 

[Trouble]

As you probably know by now, that message usually indicates that there are some critical system files missing or corrupt and will usually require a re-install of Windows.
Do you have a backup of all your critical data? Do you have a recent disk image that you could use to recover from?

 

[Bruceyfamily]

Thanks for your reply. I need to borrow a laptop so I can check on my external drive what information I have backed up. Not sure what a disk image is so don't think so. Will reply Asap.

 

[Bruceyfamily]

Hi Yes I have backed up photos/files etc on an external hard drive. I have been given a Windows 10 professional disc to boot from

 

[Trouble]

Not sure what a disk image is so don't think so.

A disk image is something I wrote about in this thread. https://www.windows10forums.com/threads/please-for-your-own-peace-of-mind.794/
There are various third party software programs, as well a windows native function that will allow you to perform such a task.

Hi Yes I have backed up photos/files etc on an external hard drive. I have been given a Windows 10 professional disc to boot from

As long as Windows 10 Pro is the same version that you had installed and the disk that you have been given is for the same system architecture (32 or 64 bit), you should be able to boot from that and reinstall Windows 10.
Otherwise you should be able to generate your own installation media from here
https://www.microsoft.com/en-us/software-download/techbench
Choose Windows 10, the first item in the first drop down (not single language at the bottom)
Next choose your language and your bit version (32 or 64 bit to match your system architecture or in the case of an upgrade, to match your currently installed version of Windows).
That will provide an ISO that will upgrade (or clean install) either or both Windows 10 Pro and Home.
Once you have downloaded the ISO you can use ImgBurn to burn it to a DVD http://imgburn.com/index.php?act=download
OR
Rufus to burn it to a USB ThumbDrive http://rufus.akeo.ie/

 

[Bruceyfamily]

Hi the windows 10 disk is ok to use as laptop is 64 bit. How do I now get it to boot from the disk?

 

[Trouble]

How do I now get it to boot from the disk?

You could either change the boot order / boot device priority in the BIOS or you could simply select it from the boot menu.
Boot menu is often F12 but could be different, check your documentation.
Likewise BIOS is often F2 but can also be different, sometimes the Delete Key, it varies but your documentation or the computer or motherboard manufacturer's support website should have the proper information.

 

[Bruceyfamily]

I have changed it in the boot order using F12 as this goes to the Toshiba Setup Utility. When I then close this and restart it then Shows the Toshiba logo and says Preparing Automatic Repair at the bottom./ then Diagnosing your PC and then the Blue Error Screen saying your PC did not start Correctly.

I can choose to Restart or Advanced options.