Windows 10: Windows Defender doesnt finish full scan

Windows Defender doesn't finish full scan and says no threats found, last scan: not available.When I try full scan with Windows Defender it doesn't finish the full scan and says:I restart PC and issue is still there, how do I fix this? I got it working by updating definitions but the issue comes back???? How do I fix it?Also, it freezes and doesn't finish after restarting PC...I ran in-place upgrade, that worked for a bit and then the issue came back. Also, did a clean install of Windows 11, scanned it the first time and it finished but the issue came back after a few days.

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windows defender scan not finish

windows defender scan not finish and stop time ...

 

defender scans

Hi Ian,

Thanks for posting your query on Microsoft Community.

This issue might occur if you have set any task scheduler for Windows Defender.

I suggest you to delete the task for Windows defender and check if it helps.

Follow the below steps:

• 
  Search and open Schedule tasks.
  
• 
  In the left-hand menu, open the Task Scheduler Library, then select
  Microsoft >Windows >Windows Defender.
  
• 
  Double-click Windows Defender Scheduled Scan.
  
• 
  Select the Triggers panel, then select Delete.
  

Hope it helps, reply to us with the status of your issue. We will be happy to assist you.

 

Windows Defender doesnt run when the system is locked

Suggestion to have a look at this wiki which in large parts also applies to Windows 10, especially see

• Will WD scan and update while my PC is asleep?
• Can WD shutdown my PC once a scan is finished?
• How do I schedule a scan with WD?

Redirecting

And I suggest to read:

How to Use the Built-in Windows Defender Antivirus on Windows 10

Configure Windows Defender in Windows 8, 8.1 and 10