Windows 10: Can't turn on Windows defender anti virus

I am not able to turn on Windows defender anti virus on my windows 10 also try to on and off defender but was not successful

:)

 

Anti Virus Problems

You should not be using more than one anti-vrus program on your computer. Read the
IMPORTANT NOTE about not using more than one anti-virus program in this

topic.

The inability to turn on Windows Defender 8/10 is typically the result of having a third-party anti-virus installed or failure to remove it properly (completely). Since Windows 8/10 Defender includes anti-virus protection, it is
disabled during the installation of another anti-virus program. If a trial anti-virus (i.e. McAfee, Norton, etc) came
preinstalled on your computer or you installed one, Windows Defender will be turned off (disabled). Windows Defender recognizes the install and automatically disables itself when other anti-virus products are used
to avoid conflicts. Windows Defender will remain disabled until that anti-virus software has been completely uninstalled. In some cases, you may need to download and run the anti-virus vendor's clean up tool to remove any remaining
remnants.

• Replacing your Anti-virus - List of Antivirus Uninstallers and Removal Tools
• Microsoft Wiki: List of anti-malware product removal tools by Stephen Boots,
  MVP

After removal of the third party anti-virus, Windows 8/10 Defender needs to be
activated if you choose to use it. When uninstalling the third-party anti-virus Defender should automatically turn itself on but sometimes you may receive a message indicating
your system has no protection...click here to turn on Windows Defender. If not, and Defender remains disabled, you will need to manually turn it on.

• How to turn Windows Defender On or Off in Windows 10
• How to turn Windows Defender On or Off in Windows 8

 

How does Windows Defender compare, in quality, to other anti-virus?

Not a very sensible choice of wording, IMO... There's no One Size Fits All and we don't do any kind of polls/ratings here in MC.

Suggestion to educate yourself by doing some researches by using your favorite search engine.

You might want to read these articles:

• Choosing an Anti-Virus Program
• Safe Steps for Replacing your Anti-virus - Why should you use Antivirus
  software?
• Supplementing your Anti-Virus Program with Anti-Malware Tools

• Best Practices for Safe Computing - Prevention of Malware Infection
  

 

I need to istall Window 10 anti virus and marvate

Windows 10 comes with in-built Anti-Virus program Windows Defender.

It depends on your own preferences if you would want to use another Anti-Virus program.

Suggest reading all of:
Best Practices for Safe Computing - Prevention of Malware Infection

especially:

• Choosing an Anti-Virus Program
• Safe Steps for Replacing your Anti-virus - Why should you use Antivirus
  software?
• Supplementing your Anti-Virus Program with Anti-Malware Tools