Windows 10: Do I really need an extra anti-virus software for protection, when I have Windows Defender...

My question is simple, do we really need an extra paid anti-virus software to protect our PC while we have built-in Windows Security. I don't understand one thing, how can a third party software will able to protect windows more efficiently than their own Windows Defender? Are paid anti-viruses more reliable than windows defender or it's just business?

:)

 

Windows Defender realtime scanning will not switch on - it detects another anti-virus product.

Windows Defender realtime scanning will not switch on, and the message suggests there is another anti-virus product present but if there is it does show up in Window 10 UI.

The long story is that I am troubleshooting a problem with application software. The manufacturer suggest removing Bitdefender because there product is incompatible. I thought I would give this a try, if only to element Bitdefender as a cause.

Firstly, I upgraded from Bitdefender 2016 to 2017 to see if that made a difference. The application still failed so I decided to try removal.

• I used the standard uninstall to remove Bitdefender 2017, rebooted but Windows Defender would not start realtime protection because another product was providing realtime protection
• I download the uninstall application for Bitdefender 2017, ran it then rebooted but Windows Defender would not start realtime protection because another product was providing realtime protection
• I checked the file system and all Bitdefender files have been deleted.
• I check the registry and found a couple of references to Bitdefender Wallet, then deleted these.
• I rebooted but Windows Defender would not start realtime protection because another product was providing realtime protection
• I reran the uninstall application for Bitdefender 2017 then rebooted but Windows Defender would not start realtime protection because another product was providing realtime protection.
  

I can find no traces of Bitdefender so I wonder why Windows Defender detects another anti-virus software. I've check other posts but couldn't find additional steps for uninstalling an anti-virus software. Any suggestions?

Moved from Windows 10

 

Is Windows Defender the only anti virus program I need?

Clarification, please.

Note that this is a Win10-specific thread.

Are you suggesting that Defender in Win10 (and Win8) does not include an anti-virus component or are you suggesting that Defender in Win10 (and Win8) does not provide sufficient (adequate; comprehensive) protection?

 

How to turn on Window Defender virus protection.

I installed Malwarebytes Anti-Malware. Now my Windows Defender is turned off. I need the virus protection but am unable to turn on Defender virus protection. I am using Windows 10. Any suggestions?