How to Fix Unexpected error Windows Defender [Steps]

What is ‘Unexpected error Windows Defender’ in Windows 10/11?

In this article, we are going to discuss on How to fix Unexpected error Windows Defender in Windows 10/11. You are provided with easy steps/methods to resolve the error. Let’s starts the discussion.

‘Unexpected error’ – Windows Defender in Windows 10/11:

It is common Windows Problem considered as Windows Defender error. This error is usually appeared when you launch and use Windows Defender antivirus software in Windows 10/11 computer. This issue indicates you are unable to launch and use Windows Defender security tool for some reasons. If you are not aware, Windows Defender is Windows built-in security program designed to scan and remove unwanted files and viruses. This tool is able to deal with all types of malicious threats and other security issues.

However, several users reported they faced Unexpected error Windows Defender problem when they use Windows Defender antivirus in Windows 10/11 computer. The possible reasons behind the issue can be the interference of conflicting tools/programs, corruption in system files or registry, issue with Security Center Service, outdated Windows OS, and other issues. It is possible to resolve the issue with our instructions. Let’s go for the solution.

How to fix Unexpected error Windows Defender in Windows 10/11?

Method 1: Fix Unexpected error Windows Defender with ‘PC Repair Tool’

‘PC Repair Tool’ is easy & quick way to find and fix BSOD errors, DLL errors, EXE errors, problems with programs/applications, malware or viruses infections in computer, system files or registry issues, and other system issues with just few clicks.

⇓ Get PC Repair Tool

Method 2: Perform Clean Boot

You can perform clean boot in computer to disable interfering applications and services that might be causing the issue.

Step 1: Open ‘System Configuration’ app in Windows PC via Windows Search Box

Step 2: Click ‘Services’ tab, tick ‘Hide all Microsoft Services’ checkbox, and hit ‘Disable All’ button

Step 3: Now, click ‘Startup’ tab and click ‘Open Task Manager’, and right-click each startup item and select ‘Disable’ to disable them and then close Task Manager

Step 4: Finally, click ‘Apply > Ok’ button on ‘System Configuration’ app to save the changes and restart your computer and check if the issue is resolved.

Method 3: Run SFC Scan and DISM Scan

You can run SFC Scan and DISM scan in computer to repair corruption in system files and system image to fix the issue.

Step 1: Type ‘cmd’ in Windows Search Box and press ‘CTRL + SHIFT + ENTER’ keys on keyboard to open ‘Command Prompt as Administrator’

Step 2: Type the following commands and hit ‘Enter’ key after each to execute.

sfc /scannow

DISM /Online /Cleanup-Image /RestoreHealth

Step 3: Once executed, restart your computer and check if the issue is resolved.

Method 4: Restart Security Center Service

Step 1: Open ‘Services’ app in Windows PC via Windows Search Box

Step 2: Find and right-click ‘Security Center’ service, and select ‘Restart’ to restart the service. Once done, check if the issue is resolved.

Method 5: Update Windows OS

Updating Windows OS to latest version can resolve the issue.

Step 1: Open ‘Settings’ app in Windows PC via Windows Search Box and go to ‘Update & Security > Windows Update’ and click ‘Check for updates’ button

Step 2: Download and install all available updates in computer and once updated, restart your computer and check if the issue is resolved.

Method 6: Fix Unexpected error Windows Defender using Registry Editor

Step 1: Open ‘Registry Editor’ app in Windows PC via Windows Search Box and go to following path

HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows Defender

Step 2: Find and double-click ‘DisableAntiSpyware’ DWORD to edit. If not found, right-click on empty space and select ‘New > DWORD (32-bit) value’ and name the value to ‘DisableAntiSpyware’

Step 3: Double-click on newly created value to edit, set its value data to ‘0’, and hit ‘Ok’ button to save the changes. Once done, restart your computer and check if the issue is resolved.

Conclusion

I am sure this article helped on How to fix Unexpected error Windows Defender in Windows 10/11 with easy ways. You can read & follow our instructions to do so. That’s all. For any suggestions or queries, please write on comment box below.

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