Windows 10: Blue Screen of Death on startup c000021a after windows update. Disabling driver signature...

Hello.I got recently a new GPU and decided to reinstall Windows 10 Pro at the same time. Everything went smoothly and everything was working fine until Windows 10 decided that it needed to update itself. After the update, I got BSOD on every boot and was unable to access the desktop at all. I was able to do a system rollback to an image before the update, and then it started working again. If I then reinstalled the windows update, things broke down again. I rolled back a few times. Eventually, I didn't have an image before the update anymore and was unable to fix it, so I decided to reinstall

:)

 

Startup Blue Screen

Hi Jon,

Startup blue screen error(s) can occur if a problem causes your PC to shut down or restart unexpectedly. It could be due to the following:

• Outdated device software drivers
• Corrupted Windows update system files
• Software/Security conflicts

We would like to know some information:

• Did you get any blue screen stop error codes?
• Have you tried booting in Safe mode?

We suggest that you check this
article about troubleshooting blue screen errors and follow the troubleshooting steps provided there.

We will wait for your response

 

Disabling driver signature enforcement

Hi Fabio,

Driver Signature Enforcement is one of the security features that we make to make sure that only signed drivers can load on your system. Note that disabling driver signature enforcement will install drivers that weren’t officially signed. Install only the
drivers you trust. Follow these steps:

• Go to Settings > Update & security >
  Recovery > Advanced startup > Restart now.
• Choose Troubleshoot > Advanced options >
  Startup Settings > Restart > F7 or 7.

Once it restarts, you may now install any third party drivers. Note that the next time you device restarts, driver signature enforcement will be enabled again.

Let us know if you need further assistance.

 

disable driver signature enforcement

Hi Barbara,

To resolve this issue, let's use the command prompt to disable driver signature enforcement permanently on your computer. To disable, follow the steps below:

• Click the Start button.
• On the search bar, type Command Prompt and then right-click
  Command Prompt in the results.
• Select Run as Administrator, and then select Yes.
• On the command prompt, enter bcdedit.exe /set nointegritychecks on and press
  Enter.
• Restart your computer.

Note: Doing this step will disable driver signature enforcement permanently and will make your computer vulnerable to driver issues.

Keep us updated with the results.