Using Windows 10, got a pop-up in message about Anti-Malware Software not found. Clicked it. Got a pop-up window listing Norton 360 and Windows Defender, both were listed as OFF. Selected Norton 360 (just in case Windows 10 had gotten confused???). Clicked Turn On. Windows 10 turned on Defender. Oops, tried to invoke Norton 360, took over 10 minutes for it to come up. When it did come up, everything looked normal. Haven't been able to access the Windows 10 Setting menu to see if Defender is running also.