Windows Defender Crashes? How to Fix it?


Windows Defender crashes can adversely affect your system as it may fail to protect your computer and information stored on it against viruses and threats.

Windows Defender is the default antivirus, spyware and malware protection in the Windows operating system. This system security program guards your computer against the execution of potentially unwanted and harmful objects.

Here we’ll discuss the problem of frequent crashing and how you can fix it in the most easiest manner..

Download the Diagnostic

There are certain situations when missing entries in your registry and registry corruption causes this problem. Try running a registry scan to identify if there are any such issues.

  1. Click the button below to download and install the Diagnostic
  2. Perform a Registry scan and fix any problems detected.
  3. Restart your computer.

Estimated Download Time: 10 Seconds

Restart Windows Defender Service

Check whether the Windows Defender service is running or stopped. If the service is not running, restart it using the following command-lines.

  1. Press Windows Key + X, select Command Prompt.
  2. Enter the following commands:
  • net stop WinDefend
  • net start WinDefend
  1. Exit

Perform System File Scan

Using System File Checker, scan for corruption in Windows operating system files and components. Repair and restore the Windows system files as shown below:

  1. Open the Command Prompt again.
  2. Type SFC/ SCANNOW and press ENTER.

Pause & Reactivate Real-Time Protection

Try pausing and re-activating the real-time scan, a mechanism that checks for viruses each time you access a file. Here are the steps to stop on-access scan:

  1. Open the Windows Defender.
  2. Click Settings icon.
  3. Click the Real-Time Protection tab.
  4. Uncheck the box named Turn on real-time protection (Recommend).
  5. Click the Save changes.
  6. Repeat the Steps # 2-3.
  7. Check-up Turn on real-time protection (Recommend), and click Save changes.

Uninstall Third Party Antivirus If Windows Defender Crashes Continue To Occur

Windows Defender may be experiencing conflict with a third party Antivirus installed on your computer. Temporarily uninstall your Antivirus and check whether the problem occurs again.

  1. Right-click the Antivirus icon in the system tray area of your Taskbar.
  2. Select Pause protection.
  3. Confirm the action in the subsequent prompt.
  4. Click Start, and then Settings.
  5. Click System | Apps & Features.
  6. Locate the Antivirus program you’re currently using.
  7. Click the Uninstall button.
  8. Follow the removal instructions on your screen.


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