Windows Defender Won't Turn On Solved

  1.    15 Sep 2017 #1

    Windows Defender Won't Turn On

    O.k....Out of curiosity I installed Avast free AV.....then decided to stay with Windows Defender, and so uninstalled, Defender won't turn on, it tells me that "another anti virus programme" is running...... any help to turn it back on appreciated.......Del.
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  2.   My ComputerSystem Spec

  3.    15 Sep 2017 #3

    Thanks for that, I did try it, but to no avail......just wondering if system restore would work ?.........
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  4. TairikuOkami's Avatar
    Posts : 3,512
    Home 1809 x64 10.0.17763.194
       15 Sep 2017 #4

    Del 80 said: View Post
    Thanks for that, I did try it, but to no avail......just wondering if system restore would work ?.........
    If you have got one prior to installing Avast, it might.

    You can also try to run this as admin:

    [Batch] Windows Defender Enable -
      My ComputerSystem Spec

  5.    15 Sep 2017 #5

    O.k.....Just done a system restore, back to the day before I installed Avast......Windows Defender is now back on !!......Thanks for the replies......Del.
      My ComputerSystem Spec

  6.    18 Sep 2017 #6

    Just an update to this thread.......on a second laptop, I couldn't use system restore to remove Avast, as I didn't know when it was installed (not my machine) used the Avast uninstaller, it worked fine, within seconds of the uninstall Windows Defender had turned itself back on, and was saying that it needed to do a scan......Del.
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