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Windows Defender Not Working Fixes
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- Problem Causes
- Third-party antivirus conflicts can prevent Windows Defender from starting
- Corrupted system files may disrupt Defender functionality
- Incorrect registry or Group Policy modifications can disable Defender
- Main Solutions
- Uninstall conflicting third-party antivirus programs
- Scan for malware and viruses
- Perform clean boot to disable background applications
- Start or restart Security Center service
- Repair Windows system files using Command Prompt
- Reset Windows Defender through PowerShell
- Enable Defender in Registry Editor
- Enable Defender in Group Policy (Windows Professional only)
- As last resort, perform in-place Windows upgrade