In other cases, the above issue, can occur if a malicious program has disabled the Windows default protection, in order to compromise your system. At this case the (previously) installed security product has modified the Windows Registry, so the default Windows protection cannot be enabled.
The above issue, commonly occurs if you have installed a different security product on your system, but you have decided to return back to the default Windows security protection ("Windows Defender" on Windows 10 & Windows 8 or "Security Essentials" on Windows 7). But some users reported that when they click the Antivirus Protection – Turn ON button in Action Center (in Windows 10: Control Panel > Security and Maintenance), Windows Defender will not start but instead the system opens at "C:\Windows\System32" folder. In a previous tutorial I had described the way to enable Windows Defender on your Windows 7, 8 or 10 based computer.
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