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Windows 10 Error 0xc000021a
Zeurth:
Hello, I'm currently completely trapped by this error. I can't boot up to safe mode, disabling the drive signatures didn't work. I don't know.
I've tried sfc /scannow and get access denied.
chsdsk gives me write protected and I've tried system restore, which has failed.
windows reset with files does not work and as I'm trying to keep them I haven't tried a full reset.
oh and dism commands have not worked as well.
Any other suggestions? I do have a usb for bootable options.
Thanks for any help that can be provided.
Boggin:
Method #5 in this article looks promising if you have Win 10 install media - https://appuals.com/how-to-fix-error-0xc000021a-in-windows-8-and-10/
Disregard anything to do with Reimage.
You can create Win 10 install media on any other computer if you haven't already done so by using this website after reading the instructions.
https://www.microsoft.com/en-gb/software-download/windows10
If using an USB and you have an UEFI BIOS then you will need to disable Secure Boot in the BIOS to boot from it.
You can access the BIOS in Win 10 by pressing and holding F2 as you switch on.
After the USB has loaded and you have navigated to the Install screen, click on Repair your computer bottom left.
Zeurth:
--- Quote from: Boggin on December 17, 2017, 12:47:49 am ---Method #5 in this article looks promising if you have Win 10 install media - https://appuals.com/how-to-fix-error-0xc000021a-in-windows-8-and-10/
Disregard anything to do with Reimage.
You can create Win 10 install media on any other computer if you haven't already done so by using this website after reading the instructions.
https://www.microsoft.com/en-gb/software-download/windows10
If using an USB and you have an UEFI BIOS then you will need to disable Secure Boot in the BIOS to boot from it.
You can access the BIOS in Win 10 by pressing and holding F2 as you switch on.
After the USB has loaded and you have navigated to the Install screen, click on Repair your computer bottom left.
--- End quote ---
Thanks for the response.
Only issue is I'm using a laptop with a bios that has a password on it.
A company laptop bios password so there's no way to get into bios.
But will try.
Edit: It didn't work.
Zeurth:
Are there any usb bootable programs that would help? Just curious.
Boggin:
As it is a company laptop then you will have to take into their IT department or for the company to deal with it if they don't have an IT department.
However, there is only one disk that I know of that can help to perhaps get you back in and that is a Kaspersky Recue Disk but it can take a number of hours for it to scan the system - it really depends upon what caused the machine not to boot.
I can't remember if you need to change the boot order for it to boot up with that disk, but you can give it a try if you like.
I have my laptops set to check the DVD and USB drives before the HDD should I need to recover mine.
https://support.kaspersky.co.uk/viruses/rescuedisk
Use the Graphics option and you will need to Ethernet connect so that it can update its Definitions.
The first time I used it on mine, when it completed, it initiated a chkdsk /f and the second time, when I took the disk out on completion - power shut down - it started up okay when I switched on.
Before you try that, see if a cold boot will get you back in.
If the battery is accessible, remove that and the AC then press the power button for approx. 30 secs and try it again.
When you said those steps didn't work - did you mean that you were able to get into the BIOS ?
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