How to Fix 0xc000021a Error on Dual Boot PC

[oryxfastidious]

I have a dual-boot setup with Windows 11 (originally Windows 10) and Ubuntu, and everything was working fine until now. Windows is showing a 0xc000021a error while Ubuntu works without any issues.
I had a previous problem with my Wi-Fi and Bluetooth drivers, so I purchased a TP-Link TL-WN725N adapter. I’ve tried several online solutions, including resetting just the Windows part of my PC, but nothing has worked. I also encountered an issue stating that c:/boot doesn't exist, even though Windows is installed on disk C.

What should I do now? Any help would be greatly appreciated!

 

[Xploit Machine]

Corrupt / Missing System Files .. just run SFC /SCANNOW

 

[Anya_Worldwide]

It seems like your boot configuration might be corrupted. Here’s another approach you can try:

Use the Media Creation Tool on another computer to create a bootable USB drive.
Restart your computer and boot from the USB drive.
Access Command Prompt: Select Repair your computer > Troubleshoot > Advanced options > Command Prompt.
Rebuild BCD: In the Command Prompt, type the following commands:
bootrec /fixmbr
bootrec /fixboot
bootrec /scanos
bootrec /rebuildbcd
These commands will rebuild your Boot Configuration Data (BCD) and help fix the 0xc000021a error.

 

[fencing_juno89]

You can also try using the DISM tool to repair your Windows image:

1. Boot into Safe Mode with Command Prompt.
2. Run DISM: Open Command Prompt as an administrator and type:
DISM /Online /Cleanup-Image /RestoreHealth
3. After DISM completes, run sfc /scannow again.
This should help resolve any deeper issues with the system image that might be causing the 0xc000021a error.

 

[oryxfastidious]

Thanks for all the help! I followed your suggestions. I created a Windows 11 installation USB, booted from it, and used the Command Prompt to run bootrec /fixmbr, bootrec /fixboot, bootrec /scanos, and bootrec /rebuildbcd. After rebooting, my Windows installation loaded without any issues. I appreciate the detailed instructions and support from everyone!