The most common reason for 0x800704ec to pop up on Windows 10 is due to the installed anti-virus program, such as Avast or AVG. As people reported, the icon of Windows Defender is grayed and delivers the error pop-up when clicking on it and selecting Turn on. The Error Code 0x800704ec is an official Windows notification, which may occur on any Windows OS version when a PC user attempts to turn on Windows Defender.
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