4 Solutions to Fix Window Defender Error Code 0x80073b01

When you try to open Windows Defender, do you get the Error Code 0x80073b01? Don’t worry! This error is not unique to you.

You might also see other errors such as “unable to start Windows Defender” or “unable to find Windows Defender on the Control Panel.” You can still see that Windows Defender has been running on your computer, and it is protecting it. Updates will be sent to you as well.

There are many users who are experiencing this Windows Defender Error Code: 0x80073b01. This error is mainly displayed when Windows Defender is damaged. Other reasons may include corruption in the registry or misconfigured application files.

Continue reading to learn how to fix the problem.

How To Fix Windows Defender Error Code 0x80073b01

These are the solutions for error 0x80073b01 in Windows 10. Please follow the steps to avoid any problems. You will find both manual and automated methods to fix your error.

Solution 1. Uninstall Third-Party Security Software

Windows Defender’s built-in features are affected by any third-party software. This is the most likely cause of this error: 0x80073b01. It is strongly recommended that you uninstall this program.

  • Click on the Control Panel.
  • Click on Install/Uninstall Program-> click Open.
  • Select the list installed.
  • Click on the program with the right click.
  • Click Uninstall.

Restart your computer or laptop after uninstalling or reinstalling it.

The above steps may be helpful, but they leave behind junk files or registry entries. You will do your best to use a powerful uninstaller from a third party that removes software without leaving any traces.

Solution 2. Registry Editor to fix Windows Defender error code 0x80073b01

This article will explain another way to fix the error 0x80073b01. This method requires you to fix any registry errors or corrupt entries.

Repairing the registry manually can be very time-consuming and risky. A small error could damage your whole system. It is recommended that you run the registry repair tool. is very powerful, and it fixes registry errors automatically.

  • Press Windows Key+R.
  • Type regedit in the Run window that opens and press Enter to open the registry editor.
  • Navigate to the left navigation pane.

HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/WindowsNT/Current Version/ImageFileExecutionOption/ and delete the msseces.exe entry. After this go to

HKEY_CURRENT-USER/Software/Microsoft/windows/Current version/Policies/Explorer/DisallowRun and again delete the msseces.exe entry.

Soulation 3. Run System File Checker Tool to Get Rid of Error 0x80073b01

A system file checker tool is included with Windows OS. It helps to scan and repair corrupt system files. Windows Defender can be corrupted if the issue is caused by system files. This method should help you fix the 0x80073b01 error.

  • Click Windows and press the X key to type the code cmd.
  • Choose Command Prompt > Run as Administrator.
  • Enter the command sfc/scannow.

Your problem should be solved after the command has been completed.

Solution 4. Update your Windows Defender

If you have not updated your Windows Defender, this may also be the cause of the error: 0x80073b01. Check for updates to see if you have any available. This method is easy to use and does not require any technical knowledge.

  • Search for a Windows update.
  • Open the results.
  • Choose Check for Updates to check for any updates.
  • Click Install to install any updates.
  • Reboot after the installation.

You can try the methods above if they don’t work or are too difficult. You can use this method to fix error 0x80073b01. To fix this error, follow the last method.

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The methods I have given you above should help you fix the error 0x80073b01 that occurs in Windows Defender. My goal was to give you the best manual solutions for your problem. Check out each method to find the best one for you.

These fixes will not only fix Windows Defender Error Code 0x80073b01 but also other Windows-related issues.

You can also use Windows Defender to start fixing the error automatically.

Good Luck_

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