Endless Reboot 0xC000021A Black Screen Blinking Cursor

If you are using Windows 8, you need to upgrade to Windows 8.1 because Windows 8 is no longer supported.

https://support.microsoft.com/help/15288/windows-8-update-to-windows-8-1

To see the update to Windows 8.1 in the Store, your PC needs to have updates KB 2871389 and KB 2917499 installed.

0xC000021A

https://support.microsoft.com/en-us/kb/956702

error codes:

0x80073712, 0x800705B4, 0x80004005, 0x8024402F, 0x80070002, 0x80070643, 0x80070003, 0x8024200B, 0x80070422, 0x80070020