Windows 10: can't open the defender antivurus

You'll need a new app to open this windowsdefender link"

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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.

 

Installing Apps on Windows 10 Has Windows Defender Finding Malware

Hi Tommy,

Welcome to the Microsoft Community.

• 
  Is this issue specific to third party apps?
  

I would suggest you to open Windows defender and add exclusions and check if it helps. Follow the steps to add exclusions in windows Defender.

• 
  Type Windows defender settings in the search bar and press enter
  
• 
  Under Exclusions click on Add Exclusion
  

Hope this information helps. Reply to the post with an updated status of the issue so that we can assist you further.

 

Windows Defender Not On

Hi,



Welcome to Microsoft Community. Your interest in Windows 10 is much appreciated.



I would suggest you to try the below methods and check:

Method 1:

I would suggest you to run virus scan to make sure the computer is free from virus.

The Microsoft Safety Scanner is a free downloadable security tool that provides on-demand scanning and helps remove virus, spyware, and other malicious software. It works with your existing antivirus software.

Microsoft Safety Scanner Download



Method 2:

Turn the Defender on. Follow the below steps:

• In search, type Defender.
• Now make the option ON by moving the slider accordingly.

Method 3: Run the SFC.

Follow the below steps:

• Open Command Prompt.

• Select “Run as Administrator”.
• Type “sfc /scannow” without quotes and hit
  Enter.

Now check for the issue.



Keep us posted if you face any issues on windows in future. We will be glad to help you.