WINDOWS 8/8.1 WINDOWS DEFENDER ISSUE!

WINDOW DEFENDER IS TURNED OFF SOLUTION!

If Windows Defender in your copy of Windows 8/Windows 8.1/10 is not working, one of the most likely reason can be that you have installed any third-party antivirus program on your computer, which has automatically disabled the Windows Defender in the OS. Microsoft itself claims that Windows Defender is just a basic anti-malware program that protects your computer from the virus attacks in case your system has no other third-party antivirus program installed in it. This further means that even Microsoft suggests that users should go for any other, comparatively more effective and efficient antivirus programs in order to enjoy the complete protection from the external threats and intrusions. 

THIRD PARTY ANTI-VIRUSES.

Another reason why Windows Defender might stop working (in case you have not installed any third-party antivirus program) can be that the Windows Defender service has been stopped because of any reason. You can check this, and if the service has been stopped, you can restart it by going to the Services snap-in which you can initialize by typing the SERVICES.MSC command in the Run command box or in the Search pane.

1. Press "Windows logo key" and "R" together
2. In the search box type services.msc
   
   
   
3. Then find windows defender there and restart by doing right click on it