How to fix Windows Defender error code 0x800b0100

Gone are those days when Windows users required third-party programs for protecting their system. Windows introduced the Windows Defender utility tool in a build of Windows 10, and ever since then, many users have stopped using other third-party antivirus programs. The Windows Defender does all that an antivirus program would do by implementing a firewall for the system while ensuring that the system does not fall victim to any malware infection.

But much like other Windows tools, the Windows Defender is also not free of errors. There have been several reports where the users said that they had issues starting the program. Whenever they try to launch the program, they see an error message on the screen that reads the error code 0x800b0100. If you are also encountering this problem on your Windows computer, this article will help you out. Here, we have included the solutions that have solved this particular error code for many Windows users. So without any further ado, let’s get into it.

How to fix Windows Defender Error 0x800b0100?

This error shows up when the user tries to launch the program, and the program won’t start at all. So, fixing this is necessary if you want to maintain the security of your device against any possible threat. You don’t need to try all the solutions mentioned in this article. Just try one solution after the other until you find the solution that solves your problem.

Perform Clean Boot:

Sometimes a third-party program can be the cause behind the Windows Defender not launching on a Windows computer. And performing a clean boot will get rid of this problem as it will disable all the third-party applications that launch when the computer boots up.

• Press Windows key + R to open up the Run dialog box.
• Enter “msconfig” in the dialog box and click on Ok.
• Go to the Services tab in the System Configuration window.
• Check the box next to “Hide All Microsoft Services.”
• Click on the Disable all button.