Windows & BSOD · low

How to fix Windows Defender is stuck scanning

Error code: WINDOWS-DEFENDER-STUCK

What this error means

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.

Updated

Before you begin

Save open work and back up important files. Use instructions for your exact device and software version. If Windows cannot start, see the startup guide.

Work through these checks

0 of 3 complete
01Update virus definitions manually
  1. Update virus definitions manually
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors
02Add exceptions for game folders and developer tools
  1. Add exceptions for game folders and developer tools
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors
03Go to Settings → Windows Security → Virus & threat protection → Manage settings
  1. Go to Settings → Windows Security → Virus & threat protection → Manage settings
What to expect

Check whether the original symptom still occurs.

If it does not help

Continue only if this check applies to your device. Consult its manufacturer if you are unsure.

Browse related errors

Possible causes

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