If a third-party trial anti-virus came preinstalled
on your computer or you installed one yourself, it most likely turned Windows 8 Defender off
(disabled) to avoid conflicts
since it includes anti-virus protection. Windows 8 Defender will remain disabled until that anti-virus software has been completely uninstalled and then Windows 8 Defender needs to be activated
if you choose to use it. When uninstalling the third-party anti-virus you may receive a message indicated your system has no protection...click here to turn on Windows Defender. If not, you will need to manually turn it on.
noknojon provided a how to link. Here is another.
Also check to make sure the Windows Defender 8 service is running (enabled).
To start (enable) a service
, press the WINKEY + R
keys on the keyboard or click the Start Orb
and in the Open dialog box, type: services.msc
or press Enter
Note: You can also click the Start Orb
and in the Search Box
, type: services.msc
Windows Services will open:
- Click the Extended tab at the bottom to view all the info on your services.
- In the Services applet, scroll down the list and find the Windows Defender service.
- Double-click on the name of the service to open the Properties page.
- In the Properties Window > General Tab that opens, click the "Start" button if it is stopped.
- From the drop-down menu next to "Startup Type", click on "Automatic".
- Click "Apply", then "OK" and close any open windows.