Windows & BSOD · low

How to fixWINDOWS-DEFENDER-STUCK

Windows Defender is stuck scanning

What this error means

WINDOWS-DEFENDER-STUCK shows up as a low-severity Windows operating system fault. Windows Defender Antivirus is causing 100% CPU or disk usage and is not responding. Typical causes include security definitions not updated and exception for system folders is not set. The steps below are ordered to resolve this efficiently.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Update virus definitions manually

Update virus definitions manually.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Add exceptions for game folders and developer tools

Add exceptions for game folders and developer tools.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Go to Settings → Windows Security → Virus & threat protection → Manage settings

Go to Settings → Windows Security → Virus & threat protection → Manage settings.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • Security definitions not updated
  • Exception for system folders is not set
  • Conflict with other antivirus software