4 Methods to Fix Error 0xc000021a ForWindows 10 & 8

Windows is prone to errors like “BSOD Error 0xc000021a On Windows 10. Every year we have millions of computer hardware launching in the market, and they usally t have different technology compared the previous generation. However, the BSOD Error 0xc000021a On Windows 10 error is mostly a software error. You can solve it by fixing the corrupted files, making changes in the settings, and more. There are several contributing factors related to the BSOD Error 0xc000021a On Windows 10 error, and we are going to list them down.

4 Methods to Fix Error 0xc000021a:

1. Do a Troubleshoot Test

Microsoft has included troubleshoot to the Windows 10, and you can use it to identify the issue easily. We are going to check the start-up settings because the computer does not work when it is starting.

The problem occurs when there is an issue with the start-up settings, drivers, programs, and more. Once we identify the issue, then we can solve it very easily. We also find if it has some major issues or we have can resolve it by fixing a driver or removing a program.

Step 1: Turn on the machine, and let it crash. You have an option on your screen “restart & advanced options.” Make sure to click on advanced options, and it will show up more options on your screen.

Step 2: Now, select troubleshoot and it opens more options for you.

Step 3: You can find “advanced options” in the list, and it will open more options.

Step 4: Select “start-up repair” first, and check if the problem resolves.

troubleshoot test

We know that the problem will not resolve with the start-up repair. Repeat the same steps, and click on “start-up settings” and select F7 and it stands for “disable driver signature enforcement.”

The computer will restart, and it works normally. In case, if the situation does not improve, then you can follow the second solution.

2. Perform SFC Scan

The file system corruption is no stranger to the Windows operating system. Fortunately, Microsoft has added necessary options to the latest edition. You can use the Command Prompt and Windows Powershell to scan the file system.

SFC stands for System File Checker, and we are going to use the tool to find out if the computer has any corrupted files or not. The official tool does not need any additional software download because it’s already available in the Windows OS.

Step 1:

  1. If you can access your computer, then press Windows key + S, and search for CMD. Make sure to run the CMD as administrator.
  2. If you are unable to access the computer at all, then we’ve to open the CMD from the advanced options. Start the computer, and you can find two options “restart & advanced options.” Click on advanced options for advanced command prompt.
  3. The advanced options offer more functions, and select “troubleshoot.”

  1. In the menu, you have more functions and select “advanced options.”

  1. Again, you have more functions and click on “Command Prompt.”

  1. The command prompt is on your screen.

Step 2: Make sure to type “sfc /scannow” in the CMD, and hit enter.

sfc /scannow

Step 3: It takes plenty of time for the Windows to complete the process. You cannot blame Microsoft because there are thousands of system files and the tool scan & verifies for consistency.

Step 4: You can monitor the progress from 0% to 100%, and you can calculate the estimated time left for the process to complete.

Step 5: It takes plenty of time to complete the process, and be patient.

Currently, my Windows machine does not have any errors or else I could have shown you a few more solutions.

3. Reset Your BIOS

If you are a technically savvy person, then you may not know about the BIOS. The motherboard manufacturer adds a utility, and it’s called “BIOS.” The BIOS contains motherboard settings like BOOT menu, security, virtualization settings, and more.

Resetting the BIOS can help you resolve the issue, and you have to remove the CMOS battery. The CMOS cell designed to power the BIOS, when the computer turned off. The CMOS cell keeps the BIOS settings saved, and if you remove it, then the settings reset.

Note: Open BIOS by pressing, ESC, F2, F2, and DEL button. Copy the BIOS settings and take a few pictures of it so that you can restore it later on.

Step 1: Open the back panel of the desktop or laptop.

CMOS battery location

Step 2: In the motherboard, you can find a silver color cell that you add in watches and laser lights.

remove CMOS battery

Step 3: Remove the CMOS battery from the motherboard and keep it aside for 10 minutes. Remember, there’s charge left in the motherboard, and you have to drain it. Leaving the motherboard without battery for ten minutes drains the charge left the circuits and other components.

CMOS battery

Step 4: Replace or add the CMOS battery back to the desktop or laptop, and the problem resolves.

The battery removal may seem like a small adjustment, but it plays a major role for BIOS. In case, if the Windows does not start or work, then restore the BIOS settings.

4. Reinstallation

If you are reading this, then there is no doubt that the system files have corrupted to the point that we cannot repair them. Again, a common problem comes with Windows. In such cases, we have no other choice but to reset the machine to put it out of the misery.

Note: Resetting your computer results in wiping entire data on your HDD. In case, if your HDD or SSD drive has partitions, then we will wipe out C: or Windows installation partition only.


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