Bitdefender and Windows Defender both active at the same time

I have Win 10 Pro x64. I recently upgraded from Bitdefender Internet Security 2015 to Bitdefender Total Security 2016. With both versions, I notice that whether booting cold or a restart, sometimes Windows Defender is active (can be accessed thru the Control Panel icon and updates itself etc) and other times it is inactive "The application is turned off and is not monitoring your computer". Same thing with the Windows Firewall.

Is this a known 'bug', maybe with Windows Defender or Bitdefender, that allows Windows Defender to enable itself, seemingly randomly when starting/restarting the PC. My understanding is that the 3rd party AV should permanently override and disable Win Defender.

I presume that this is not a good thing and conflicts between the two will result in problems/instability.

bjames36 said:

I upgraded to windows 10 from 8.1 yesterday I have windows 10 home,x64. I also have bitdefender free version and it appears to be "on". Windows Defender says that it is on also. On the internet, there are some comments that say Bitdefender will not work with Windows 10. My question is should I uninstall bitdefender even though it says it is on? Your comments and opinions will be apprecitated!

Bitdefender works on Windows 10.

GregH said:

I have Win 10 Pro x64. I recently upgraded from Bitdefender Internet Security 2015 to Bitdefender Total Security 2016. With both versions, I notice that whether booting cold or a restart, sometimes Windows Defender is active (can be accessed thru the Control Panel icon and updates itself etc) and other times it is inactive "The application is turned off and is not monitoring your computer". Same thing with the Windows Firewall. Is this a known 'bug', maybe with Windows Defender or Bitdefender, that allows Windows Defender to enable itself, seemingly randomly when starting/restarting the PC. My understanding is that the 3rd party AV should permanently override and disable Win Defender. I presume that this is not a good thing and conflicts between the two will result in problems/instability.

I would completely remove Bitdefender then try reinstalling it.

You said:

I would completely remove Bitdefender then try reinstalling it.

I am not at all sure what happened, but I have been checking the status of my virus protection about everyday.
Windows Defender is off and Bitdefender is working and active.
I believe it was operator error. Sorry about that, thanks for your replies!