Windows 10: Windows Defender wants to run at startup


  1. Posts : 51
    Windows 10 Pro 64-bit
       02 Apr 2017 #1

    Windows Defender wants to run at startup


    Since a very recent reinstall of Windows 10, Windows Defender now keeps wanting to be part of Start-up..In the past it seems to me that it was only activated if your anti-virus protection was off or if none was installed. Now it seems as if the intention of Windows Defender has changed to be actively running when windows starts.

    Can I allow it to run along with my antivirus & anti-malware programs?
      My ComputerSystem Spec

  2.    02 Apr 2017 #2

    You can have only one Anti-Virus program running on your computer or they will conflict. When you install a 3rd party AV product, Windows Defender automatically disables. You can run Malware programs like Malwarebytes along with Windows Defender.
    What is your 3rd party AV Software?
      My ComputerSystem Spec


  3. Posts : 51
    Windows 10 Pro 64-bit
    Thread Starter
       02 Apr 2017 #3

    spunk said: View Post
    When you install a 3rd party AV product, Windows Defender automatically disables.
    What is your 3rd party AV Software?
    -- I know that Windows Defender always used to disable when you have a 3rd. party AV product. But after my recent reinstall of Windows 10, it has put itself into the list of startup programs. I removed it several times and it keeps coming back.

    -- I have Kaspersky Total Security 2017 and also running real-time, Reason Core Security (Free).
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  4. Posts : 51
    Windows 10 Pro 64-bit
    Thread Starter
       02 Apr 2017 #4

    Upon further investigation, I notice that what's in the startup is the Windows Defender Notification Icon (MSASCuil.exe).

    What I'm still not clear on is what's stated within the highlighted bit on the top image below.

    The bottom image shows the Windows Defender Notification Icon (MSASCuil.exe) within the Startup.

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  5. Bree's Avatar
    Posts : 8,570
    10 Home x64 (1803) (10 Pro on 2nd pc)
       02 Apr 2017 #5

    It is safe to let Defender run as an on-demand file scanner (or periodically scheduled) even with another AV providing real-time protection. Scanning files won't load Defender's memory-resident AV protection, so there should be no conflict.

    MSASCuiL is the user interface and puts the icon in the notification area. This has been a startup item since 1607 was released. On its own, MSASCuiL does not load the memory-resident AV either.

    Are you sure you actually had 1607 before your recent repair-install? If you had in fact upgraded from 1511 to 1607 then this would be the first time you would have seen this behaviour.

    Defender's memory-resident AV services (if running) are shown in Task Manager on the Services tab as WinDefend and on the Details tab as MsMpEng.exe. With your other AV running this should be shown as 'Disabled' in Services. If not, try reinstalling your other AV.

    You can make the icon disappear from the notification area by killing MSASCuiL in Task Manager. You cannot remove it from start up (well, you can, but Defender puts it back again at reboot). If you want to make the icon go away...

    ...you just have kill the task at start-up. You can do this for your user account by putting a .bat file in the folder:
    C:\Users\<your_username>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup
    containing the command:
    taskkill /im MSASCuiL.exe

    For all users you could put it in:
    C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp
    Cannot remove Windows Defender Tray Icon

    The icon will reappear (and stay there until you kill it) if you ever open Defender (because doing so runs MSASCuiL).
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  6. WOT's Avatar
    Posts : 471
    Win 10 Pro 15063.332 (ex-Insider)
       02 Apr 2017 #6

    I didn't read all of the threads but you can just disable the Defender notifications in the startup tab. That will try to start even if you have a 3rd party AV running in the active mode. Also, I am sure you are aware that you can have some of the AVs running in a passive mode along side of Defender. Avast is one that offers that option but I chose not to use it and now Avast is the exclusive protector of my PC.

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      My ComputersSystem Spec


  7. Posts : 51
    Windows 10 Pro 64-bit
    Thread Starter
       03 Apr 2017 #7

    Bree said: View Post
    Defender's memory-resident AV services (if running) are shown in Task Manager on the Services tab as WinDefend and on the Details tab as MsMpEng.exe. With your other AV running this should be shown as 'Disabled' in Services. If not, try reinstalling your other AV.
    Thanks for the info Bree. In the Services tab within Task Manager, WinDefend is shown as stopped (see top image). In the Details tab there is no indication of MsMpEng.exe (see bottom image).

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  8. Bree's Avatar
    Posts : 8,570
    10 Home x64 (1803) (10 Pro on 2nd pc)
       03 Apr 2017 #8

    Razz said: View Post
    In the Services tab within Task Manager, WinDefend is shown as stopped (see top image). In the Details tab there is no indication of MsMpEng.exe (see bottom image).
    Then Defender is set up as it should be when another AV is installed. The optional 'limited periodic scan' is a safe 'second opinion' - up to you whether you leave it turned on.
      My ComputersSystem Spec

  9. Bree's Avatar
    Posts : 8,570
    10 Home x64 (1803) (10 Pro on 2nd pc)
       03 Apr 2017 #9

    WOT said: View Post
    I didn't read all of the threads but you can just disable the Defender notifications in the startup tab.
    That will only work while Defender's real-time protection is turned off (as it is when you have another AV). The first thing MsMpEng.exe does when run is to check all it's registry keys and reset them if they've been modified - including that startup one.
      My ComputersSystem Spec


 

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