Windows 10: I cannot turn on windows defender because onother antivirus installed and i donot know it...

i cannot turn on windows defender because onother antivirus installed and i donot know it and found nothing after searching about any antivirus but i didn't found it * Moved from Community Center

:)

 

How to stop “windows defender antivirus service”?

Hello, *Smile

If you are wanting to turn off Windows Defender Antivirus, then you could use an option in the updated tutorial below. Be sure to turn off Tamper Protection first in step 1.

Turn On or Off Windows Defender Antivirus in Windows 10

 

WINDOWS DEFENDER is turned off

To further isolate your concern, we'd like to know if you have other security programs installed on your computer.
Windows Defender will automatically shut itself off if there are other antivirus or security programs installed. There's a possibility that a trial version of other security program was installed on your computer. Also, if the third-party security
program installed has a Firewall, then Windows Firewall will also stop working. Since Windows Defender is dependent to Windows Firewall, then that's a reason why it won't be turned on.

We suggest that you check your computer for any third-party security program via
Programs and Features, then you will have to uninstall your third-party security software and reboot the system. Once you've rebooted your PC, turn on Windows Defender manually by following the steps below:

• Type Windows Defender in the Search bar and press
  Enter.
  
  
• Go to Settings and make sure that the Turn on real-time protection option is turned on.
  

NOTE: Antivirus software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. You should re-enable your antivirus or other security software as soon as you're
done. If you're connected to the Internet or a network while your antivirus software is disabled, your computer is vulnerable to attacks.


Kindly update us with the result and let us know if you need further help.

 

Windows Defender of Windows 10 stoped working and is not turning on

Hello NasirMahmood1,

Thank you for writing to Microsoft Community forum.

Have you installed any third party anti-virus software?

Step 1: Turn Windows Defender Service On.

Initially, we need to check with the status of
Windows Defender Service which might be stopping the defender to turn on.

• Press Windows key + R and type
  services.msc and press Enter key.
  
• Search for Windows Defender Service and check if it has been started.
  
• Right click on Windows Defender Service and click on
  Restart.
  

Step 2: Turn On Windows Defender Antivirus using Group Policy.

As you are on Windows 10 Pro build, I would suggest
gpedit.msc settings from the following link and set it to Disabled or not configured to
turn on real time protection setting. Follow the steps mentioned under
Disable real-time protection from the article-
Enable and configure antivirus always-on protection and monitoring.

Hope it helps.

Regards,

Mala S

Microsoft Community – Moderator