Windows 10: Why does WIn10 start with "Realtime Protection" disabled?

I have it pretty frequently lately that somewhen between 15 and 30 minutes after a system restart I get an warning-popup telling me that my system's real-time protection is off and that this leaves my system vulnerable.
I then typically go into the security settings and enable the real time protection after which things seem to be fine again.

But WHY does Windows start with this setting disabled??? That leaves me pretty puzzled and slightly disturbed. :-(

:)

 

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

 

Segurazo realtime protection lite

Segurazo realtime protection lite got downloaded to my Cpu from ? and I have tried to uninstall but it just does not move. Any suggestions?

 

Realtime Protection

When I do Windows Defender update, the realtime protection turns off. Why?