Quick fix: Windows Defender update error 0x8050800c

Madalina Dinita
by Madalina Dinita
Madalina has been a Windows fan ever since she got her hands on her first Windows XP computer. She is interested in all things technology, especially emerging technologies -- AI and DNA computing in... Read more
Affiliate Disclosure
  • The Windows Defender update error 8050800c can be caused by incompatibility issues with other third-party antiviruses.
  • If you encounter this problem, restarting your system is a solution that worked for many.
  • Another procedure that you should try is disabling or even uninstalling the security app you use.
  • Cleaning your registry with a dedicated tool can also resolve the error 8050800c and other performance PC issues.
windows defender error 0x8050800c
ESET Antivirus comes with all the security tools that you may ever need to protect your data and privacy, including:

  • Anti-theft support
  • Webcam protection
  • Intuitive setup and UI
  • Multi-platform support
  • Banking-level encryption
  • Low system requirements
  • Advanced anti-malware protection

An antivirus program needs to be fast, efficient, and cost-effective, and this one has them all.

Installing the latest Windows Defender updates helps you to keep your computer safe. Usually, Windows 10 will automatically download and install updates once a day for you. 

You can also download the latest updates manually. However, there are instances when users can’t install the latest Windows Defender updates due to various error messages.

Error 0x8050800c is one of the most frequent Windows Defender issues. Users are complaining on Microsoft Community forum about it.

I am getting this error whenever I want to update the virus definition in Windows Defender. Sometimes the defender itself automatically turns off. […] The error code I am getting is: 0*8050800c. What should I do? I am using Windows 10.

If you’re experiencing the annoying error 0x8050800c on your computer, follow the instructions listed below in order to fix it for good.


How do I fix Windows Defender update error 0x8050800c?

1. Restart your computer

First of all, you should try to restart your PC, then download and install the latest Windows Defender updates.

Users report that a simple action such as rebooting your computer eliminates error 0x8050800c and allows you to update your antivirus.

Expert Tip: Some PC issues are hard to tackle, especially when it comes to corrupted repositories or missing Windows files. If you are having troubles fixing an error, your system may be partially broken. We recommend installing Restoro, a tool that will scan your machine and identify what the fault is.
Click here to download and start repairing.

Restarting is one of the most used troubleshooting steps and usually, the first one taken when users are dealing with software or other computer issues.


2. Install the latest Windows 10 Updates 

If there are any pending Windows 10 updates, install them first and then try to update Windows Defender. Many users confirm that this simple action solves the majority of Defender’s errors.

Once you have installed the latest Operating System updates, restart your computer and try to update your antivirus.

If you can’t install Windows Updated due to errors, we recommend you to check our dedicated guide and easily fix this problem.


3. Make sure you’re not running a third-party antivirus

It is possible that you’ve installed another antivirus program on your computer. If such is the case, this may explain why you can’t update Windows Defender.

Uninstall the third-party antivirus solution from Control Panel, as you usually do with any program. In case this doesn’t completely remove it, use a software removal tool.

If you’re a Norton user, we’ve got a detailed guide on how to completely remove it from your personal computer. 


4. Clean your registry

If your system files are corrupted, Windows Defender may not be able to download and install the latest updates.

In order to quickly scan and repair your registry, install a registry cleaner on your computer and let it do its job.

Windows Update is meant to improve the overall performance of your operating system, integrate new features, and even upgrade the existing ones. However, there are times when certain errors may occur out of the blue.

Thankfully, if you happen to run into such issues, there is a specialized Windows repair software that can help you solve them in no time, and it is called Restoro.

This is how you can fix registry errors using Restoro:

  1. Download and install Restoro.
  2. Launch the application.
  3. Wait for the application to find any system stability issues and possible malware infections.
  4. Press Start Repair.
  5. Restart your PC for all the changes to take effect.

After the process is completed your computer should work perfectly fine and you will no longer have to worry about Windows Update errors of any kind.

Get Restoro


Disclaimer: This program needs to be upgraded from the free version in order to perform some specific actions.



Windows Defender offers basic protection for your PC. Thus, consider using any of these best antiviruses compatible with Windows 10.

If you’ve come across the error 0x8050800c, we hope the 4 solutions listed above helped you to fix Windows Defender’s update issues.

Also, if you have any other questions or suggestions you may have for us, leave them in the comments section below, and we’ll be sure to take a look.

tipProtect your PC now!
Don't leave your PC unprotected! Get one of the best antivirus tools in the world and navigate the Internet without worries! ESET Antivirus comes with all the security tools that you may ever need to protect your data and privacy, including:

  • Webcam protection
  • Multi-platform support
  • Low system requirements
  • Top-notch anti-malware protection

This article covers:Topics: