I have had the same problem, and when i type "net start windefend" in the
command prompt (black and white screen), I get:
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The Windows Defender Service service is starting.
The Windows Defender Service service could not be started.
A system error has occurred.
System error 2 has occurred.
The system cannot find the file specified.
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I found a weird but successful way of solving the issue. I just uninstalled and reinstalled the software by downloading it again from
www.microsoft.com
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