1.    15 Sep 2017 #1
    Join Date : Mar 2016
    Posts : 137
    Windows 10

    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 Avast......now, Defender won't turn on, it tells me that "another anti virus programme" is running...... any help to turn it back on appreciated.......Del.
      My ComputerSystem Spec
  2.    15 Sep 2017 #2
    Join Date : Oct 2014
    Trnava
    Posts : 2,862
    Windows 10.4 Home 1709 x64
      My ComputerSystem Spec
  3.    15 Sep 2017 #3
    Join Date : Mar 2016
    Posts : 137
    Windows 10
    Thread Starter

    Thanks for that, I did try it, but to no avail......just wondering if system restore would work ?.........
      My ComputerSystem Spec
  4.    15 Sep 2017 #4
    Join Date : Oct 2014
    Trnava
    Posts : 2,862
    Windows 10.4 Home 1709 x64

    Quote Originally Posted by Del 80 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 - Pastebin.com
      My ComputerSystem Spec
  5.    15 Sep 2017 #5
    Join Date : Mar 2016
    Posts : 137
    Windows 10
    Thread Starter

    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
    Join Date : Mar 2016
    Posts : 137
    Windows 10
    Thread Starter

    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).....so 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.
      My ComputerSystem Spec

 


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