0xc000021a error cant start my computer

[Jere]

Hello, this morning i noticed that my computer did not start and gave me a blue screen with 0xc000021a error on it. I have browsed internet for 3 hours now and all solutions i found are solutions which require the computer to be running to fix it, or something about portable usb restoration or something like that. I dont know what have i done wrong. I dont have the disk for w10 because i upgraded it from w7. I have a laptop too, if i need that in this process. Thanks for help in advance.

 

[Trouble]

I have a laptop too, if i need that in this process.

You need to acquire the installation media to boot your system, if it a continuous Blue Screen situation, where multiple attempts at rebooting the system always produce the same Blue Screen and error.
The installation media can be obtained through either of these two resources.

https://www.microsoft.com/en-us/software-download/techbench
OR
http://www.microsoft.com/en-us/software-download/windows10

Once you have the ISO, you can use ImgBurn to burn it to a DVD or Rufus to burn it to a USB ThumbDrive, either of which you can use to boot your computer.

When you've managed to boot from the installation media you need to click the Repair Your PC link on the second page after the Choose a Language and Keyboard layout page.
That should get you to the Advanced Troubleshooting options.
From there you might try a System Restore, to an earlier point in time, or......
Use Startup Settings to see if you can boot the computer into safe mode.

You might also give Startup Repair a go and see if that helps, but....
You may have to do it multiple (three) times in order for it to produce results, if at all.