How To Fix Windows Defender Error Code 0x800b0100 [Solved]

Windows Defender error code 0x800b0100 arises if the system is already infected by malware or virus. Further, improper downloading of OS files is also one of the main reasons for this issue. 

If any third-party antivirus software is running in the system, then this error might arise due to conflict. Whatever be the reason, you need to resolve the problem at the earliest to avoid any further glitch.

Thus, you need to know the effective hacks that can help to eliminate the glitch associated with the Windows Defender Service. 

Effective Tricks to Fix Windows Defender Error Code 0x800b0100

Use the easy methods given below to fix the error permanently. You need to follow the steps in the exact sequence provided. 

Solution 1: Clean Boot 

A clean boot can help to fix all the run-time errors associated with Windows Defender. So, here are the steps that you need to implement:

  1. At first, press and hold the Windows key and R at the same time on the keyboard. 
  1. After that, enter ‘msconfig’ and then hit the Enter key. 
  1. Then, go to the Services option and select the ‘Hide All Microsoft Services’ option. 
  1. After that go to the Disable All option and select the Startup option. 
  1. Thereafter, go to the Task Manager option and choose the Disable option. 
  1. Now, you need to repeat for every item in the Startup tab and then close the Task Manager option.  
  1. Thereafter, go to the System Configuration window and click on the OK option. 
  1. In the end, reboot the device and check whether the problem is fixed or not.

If not then you need to proceed to the next solution to fix the Windows Defender error. 

Solution 2: Check Windows Defender Service

Here are the steps that you need to follow to check Windows Defender service. 

  1. At first, press and hold the Windows key and R at the same time on the keyboard. 
  1. After that, enter services.msc and then hit the Enter key. 
  1. Then, go to the Windows Defender option and select the Windows Defender Service option. 
  1. Now, check whether the Startup Type is Automatic or not. You also need to check if the service is in the Started type or not. 
  1. In the end, check Windows Defender Advanced Threat Protection Service and Windows Defender Network Inspection Service. 

You should check whether these are enabled or not. If the options aren’t greyed out, change it and you should not set it to automatic. 

Solution 3: Run SFC Scan 

Often a simple scanning of the system files can help to detect the root cause. Thus, you can run the SFC tool that comes along with  Windows OS. 

To run the SFC scan, you need to follow the below-mentioned steps. 

  1. At first, click on the Windows Start option. After that, go to the Windows Search option and then, search for ‘cmd’. 
  1. Now, click on the Command Prompt option to open it with administrative privileges. For that, go to the list and click on the Administrator option. 
  1. Now, enter the following command and then hit the Enter key to run this utility. 

Solution 4: Revert the Changes 

If you have made any changes in the system’s settings then you need to reconfigure it. This will help to fix any random error than occurred unknowingly. 

Here are the steps that you need to follow to revert the changes. 

  1. At first, go to the System Configuration window and click on the General tab to the various options. 
  1. After that, go to the menu and click on the Normal Startup option. Thereafter, select the Services tab of that window. 
  1. Now, uncheck the checked option and for that, perform a clean boot. Generally, it is stated as  “Hide all Microsoft Services”.
  1. Next, go to the right-bottom corner of that tab and select the Enable All option. 
  1. Then, go to the Task Manager option and choose the Startup tab to enable all the applications. 
  1. In the end, reboot the device and check whether the error is solved or not. 

Solution 5: Use the DISM Feature  

To fix Windows Defender error code 0x800b0100, you need to use the DISM Feature. To run the tool,  follow the below-mentioned steps properly. 

  1. At first, select the Windows key and X at the same time on the keyboard. 
  1. After that, go to the list of options and click on the Command Prompt. At that time, you should make sure that you have admin access in order to make the necessary changes. 
  1. Thereafter, enter ‘dism.exe /Online /Cleanup-image /Restorehealth’ command and then hit the Enter button to start the process. 

Now, wait until the process to complete successfully and hopefully, the error will disappear. 

Applying the above solutions appropriately will help you to resolve the Windows Defender error code 0x800b0100 without any hassle.