How to Fix (Windows Defender Error Code 0x80073b01)? 2024

When you try to open Windows Defender, do you also get the error code 0x80073b01? Don’t be afraid! Many people are also getting this error, so you are not alone.

You might see other problems like “not able to find Windows Defender in Control Panel” or “not able to start Windows Defender.” Even though this is the case, you may still see a message that says Windows Defender is running and protecting your computer. You may also get updates for it, but you still need help to start it.

There are a lot of times when people get this Windows Defender error code 0x80073b01. This mistake usually happens when Windows Defender is broken, but it could also be caused by a problem with the registry or a file that isn’t set up right.

If you want to get out of this position, keep reading to find out how to fix your error.

How To Fix Windows Defender Error Code 0x80073b01?

Here are the things you can do to fix the Windows 10 problem 0x80073b01. Carefully follow the steps so you don’t have to deal with any problems. I will talk about automatic and human ways to fix the error you are getting.

Method 1: Uninstall third-party security

Windows Defender’s built-in security features are messed up by any security software from a third party. This mistake 0x80073b01 appears to be. I suggest that you get rid of it.

  • Go to the Control Panel and click on Install/Uninstall Program. Then, click Open.
Method 1: Uninstall third-party security
  • Please choose a program from your loaded list or right-click on it. Click Uninstall to finish.
  • After you remove or restore something, please restart your computer or laptop.

The steps above are helpful but leave behind junk files or system entries. It would help if you used a strong third-party uninstaller tool that removes the software without leaving any clues.

There are a lot of tools for removing things on the market, but I’ll suggest the powerful Revo Uninstaller. This is the best, and it eliminates all of your apps.

Method 2: Fix Windows Defender Error 0x80073b01 with Registry Editor

I’ll talk about another way to fix error 0x80073b01 here. In this method, you need to fix any broken registry records or other problems with the registry.

Well, fixing the records by hand is very risky and takes a lot of time. If you make a mistake, your whole system could be ruined. So, the Registry Repair Tool is proposed here. That is very powerful and will quickly fix registry errors.

Method 2: Fix Windows Defender Error 0x80073b01 with Registry Editor
  • Press the Windows key + R, type regedit in the pop-up box, and press Enter to start Registry Editor.
  • Use the menu on the left to get to

HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/WindowsNT/Current Version/ImageFileExecutionOption/delete the item for msseces.exe. After this, check out.

Method 2: Fix Windows Defender Error 0x80073b01 with Registry Editor

The file’s name is HKEY_CURRENT_USER/Software/Microsoft/Windows/Current version/Policies/Explorer/Disallow.Start the computer and delete the msseces.exe file again.

Method 3: Run the System File Checker Tool

System File Checker Tool is part of the Windows operating system and helps find and fix damaged system files. Suppose the problem comes up because Windows Defender has broken system files. Then, this method should help you fix the Error Code 0x80073b01.

Method 3: Run System File Checker Tool
  • Click the Windows + X key, type “cmd,” choose “Command Prompt,” and then click “Run as Administrator.”
Method 3: Run System File Checker Tool
  • Type the program, sfc/scannow, and press Enter to carry it out.

Method 4: Update your Windows Defender

You may also get the error code 0x80073b01 if your Windows Defender is outdated. So check for changes and see if there is an update for you. This method is very easy; anyone can do it because they don’t need any technical skills.

Method 4: Update your Windows Defender
  • Click the “Windows” key, then click “Search,” then type “Windows Update.”
  • Open the endpoint.
Method 4: Update your Windows Defender
  • Select Check for updates and see what changes are available.
  • If there are any changes, click “Install.”
  • When the installation is done, restart the computer.

Try something else if you need help with the ways above or seems hard to do. Then, I can help you eliminate error 0x80073b01 simply and helpfully. To fix this problem, use the last solution.

Method 5: Run the Windows Repair Tool

If you don’t know enough about computers to follow the guided steps, you should use a powerful tool to fix Microsoft Security Essentials error code 0x80073b01 or any other Windows problem.

To fix this problem, experts say to use the Windows Repair tool. It will also help you fix other problems, like broken files or a messed-up system, and protect your device from viruses or malware. This will not only fix problems but also make your Windows PC run better.

Sometimes, it’s easier to fix Windows problems and other mistakes with an automatic answer than a manual one. It would help if you gave the automatic fix tool a try.


One of the above ways helps you fix Windows Defender error code 0x80073b01. I did my best to help you solve your problem by telling you how to do it by hand. So try one at a time to see which works best for you.

The solutions above will not only help you fix the Windows Defender error code 0x80073b01, but they will also help you fix other Windows problems.

You can also use Windows Defender’s automatic fix to fix the problem quickly and start using it.

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