How to fix "Unexpected Error" in Windows Defender?

Question

Issue: How to fix "Unexpected Error" in Windows Defender?

Hello. I tried to use Windows Defender to run a scam but I received a message saying “Unexpected Error.” What could be the problem?

Solved Answer

Windows Defender or Microsoft Defender Antivirus is an anti-malware component of Microsoft Windows. It provides some basic functions when it comes to operating system security. It can warn users about malware[1] infections and other cybersecurity threats.

When Windows Defender first came out, it only protected users from spyware. Now, people can feel safe when using Windows without third-party antivirus software. However, sometimes people run into issues when trying to use it. Users report receiving an “Unexpected Error” when trying to run a scan. The full message reads as follows:

Threat service has stopped. Restart it now.

Unexpected error. Sorry, we ran into a problem. Please try again.

While it is unknown what exactly could cause the Windows Defender to produce this error, we prepared 6 steps that could help you fix it. The problem is suspected to appear because of missing updates, third-party antivirus interference, or the Security Center service.

Manual troubleshooting can become a lengthy process, so you can also use a maintenance tool like ReimageMac Washing Machine X9 that can fix most system errors, BSODs,[2] corrupted files, and registry[3] issues. Otherwise, follow the step-by-step instructions below.

How to fix Unexpected Error in Windows Defender

Method 1. Install Windows Updates

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  • Type Updates in Windows search
  • Click Check for updates and wait till the process is finished
  • If optional updates are available, install them too

Install Windows Updates

  • Once done, restart your system

Method 2. Fix Corrupted System Files

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To repair damaged system, you have to purchase the licensed version of Reimage Reimage.

Use Command Prompt commands to repair system file corruption:

  • Open Command Prompt as administrator
  • Use the following command and press Enter:
    sfc /scannow

Fix Corrupted System Files

  • Reboot your system
  • If SFC returned an error, then use the following command lines, pressing Enter after each:
    DISM /Online /Cleanup-Image /CheckHealth
    DISM /Online /Cleanup-Image /ScanHealth
    DISM /Online /Cleanup-Image /RestoreHealth

Method 3. Uninstall Third-Party Security Software

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Your third-party antivirus program could be interfering with Windows Defender, resulting in an error. We suggest you try to uninstall the software and see if the issue disappears.

  • Go to Apps & Features
  • Find your antivirus in the list and click on it
  • Press Uninstall and finish the process

Uninstall Third-Party Security Software

Method 4. Restart the Security Center Service

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  • Press Windows key + R to open the Run box
  • Type services.msc and hit Enter
  • In Services, search for Security Center
  • Right-click on Security Center and click on Restart

Restart the Security Center Service

Method 5. Change Registry Key Values

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To repair damaged system, you have to purchase the licensed version of Reimage Reimage.
  • Press Windows key + R to open the Run box
  • Type Regedit and press Enter
  • Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
  • Change both DisableAntiSpyware and DisableAntiVirus values to 0 by double-clicking
  • If the keys are not showing, right-click on an empty space, select New, and click on DWORD (32-bit) Value
  • Name the key DisableAntiSpyware and set the value to 0

Change Registry Key Values

  • Do the same for DisableAntiVirus

Method 6. Perform a Repair Upgrade

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To repair damaged system, you have to purchase the licensed version of Reimage Reimage.
  • Download the Windows 10 ISO file from the official Microsoft website
  • If you agree to the license terms, select Accept
  • On the What do you want to do? page, select Create installation media for another PC and then select Next

Perform a Repair Upgrade

  • Select the language, edition, and architecture (64-bit or 32-bit) for Windows 10
  • In Select which media you want to use, Select ISO file then click Next
  • Select the download location then click Save
  • Windows 10 ISO file will be downloaded
  • Right-click Windows 10 ISO file and click Mount
  • Open Setup.exe
  • To get important updates, select Download and install updates
  • Ensure that Keep personal files and applications is checked
  • Click on Install to start the upgrade

Repair your Errors automatically

ugetfix.com team is trying to do its best to help users find the best solutions for eliminating their errors. If you don't want to struggle with manual repair techniques, please use the automatic software. All recommended products have been tested and approved by our professionals. Tools that you can use to fix your error are listed bellow:

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Still having problems?
If you failed to fix your error using Reimage, reach our support team for help. Please, let us know all details that you think we should know about your problem.
Reimage - a patented specialized Windows repair program. It will diagnose your damaged PC. It will scan all System Files, DLLs and Registry Keys that have been damaged by security threats.Reimage - a patented specialized Mac OS X repair program. It will diagnose your damaged computer. It will scan all System Files and Registry Keys that have been damaged by security threats.
This patented repair process uses a database of 25 million components that can replace any damaged or missing file on user's computer.
To repair damaged system, you have to purchase the licensed version of Reimage malware removal tool.

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Don’t pay ransomware authors – use alternative data recovery options

Malware attacks, particularly ransomware, are by far the biggest danger to your pictures, videos, work, or school files. Since cybercriminals use a robust encryption algorithm to lock data, it can no longer be used until a ransom in bitcoin is paid. Instead of paying hackers, you should first try to use alternative recovery methods that could help you to retrieve at least some portion of the lost data. Otherwise, you could also lose your money, along with the files. One of the best tools that could restore at least some of the encrypted files –  Data Recovery Pro.

About the author
Jake Doe
Jake Doe - Computer technology geek

Jake Doe is the news editor at UGetFix. Since he met Ugnius Kiguolis in 2003, they both launched several projects that spread awareness about cybercrimes, malware, and other computer-related problems.

Contact Jake Doe
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