Windows 10: why won't windows defender turn back on?

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Windows defender is turned off and won`t turn back on

Windows defender on windows 10 enterprise won`t turn on. This happened shortly after i updated it; when I try to turn it on it says:

This app has been turned off and it isn't monitoring your computer.

And right underneath it, it says:

If you are using another app for malicious and unwanted software use Security and Maintenance to check that app`s status.

Need for a response ASAP, thanks

 

Asus Transformer t100ta won´t turn on Win10

Yesterday was reading on it. All of a sudden turned off and now it won´t turn on

 

Windows defender is turned off and won`t turn back on

Did you just upgrade to Win 10?

I notice you're using Win 10 Enterprise. Are you part of a network and/or connecting to the internet via a server?



The behavior you are describing is typical if there are remnants of a third party program interfering with Windows Defender. This may occur even if WD was working okay on Win 8.1 before you upgraded to Win 10.



Protect your PC - Microsoft Support
Note the comment in this document published by Microsoft that Windows Defender automatically turns off if you install another antivirus app.



Go to Security and Maintenance, look in 'Security' and see what program is listed under Virus Protection. Windows Defender will not be enabled and working properly if there is a program other than Windows Defender
listed.



Think back to what other antivirus programs have been previously installed. Do you remember which AV product came pre-installed or was previously on the computer? Maybe McAfee or Norton? Try running the removal tools for any AV
program that has ever been on the computer and then reboot...then try enabling Windows Defender though it might be automatically enabled and working properly.



See List of
anti-malware product removal tools



Have you tried the steps recommended in Problems
starting Windows Defender in Windows 8/8.1/10 ?



For further information see the reply of quietman7 in
this thread: Redirecting.



Alternatively you can consider a reset which will essentially be a “clean install” of Win 10 but you’ll lose installed programs and data/pics/music that is on the computer. https://support.microsoft.com/en-us/help/12415/windows-10-recovery-options



Or - install a third party antimalware program (doing so should disable the real time protection of Windows Defender) and use the third party program for your antivirus protection.



Choosing an Anti-Virus Program



Is Windows
Defender The Best For Windows 10? Good article but ignore the ads.



AV Poll 2015 - Security | DSLReports Forums



http://windows.microsoft.com/en-US/windows/antivirus-partners#AVtabs=win10



Good luck...



http://blog.emsisoft.com/2015/01/27/top-10-ways-pups-sneak-onto-your-computer-and-how-to-avoid-them/