Cortana was installed automatically when I upgraded to Windows 10... It was working fine... When I turned off Location, Cortana would not work and instruct to turn Location On first... But after the virus... Cortana worked even with the Location in the Off mode... In the Location tab, I tried to click CHANGE for the Location for this device is off... nothing happens.
I know something is not right since on my Sony Vaio, I could click CHANGE for the Location for this device is off... and the Location button in Notification is not greyed out. And on the Sony Vaio, Cortana will not also work if Location is turned off.