Windows Defender Deacticated and can't activate



My laptop has Windows Defender missing. I tried all solutions listed in ( Problems starting Windows Defender in Windows 8/8.1/10 ) . Last time this problem occurred, I installed Win 10 on formatted C drive. But I am searching its cause this time.
( Info: My laptop is missing Hibernate option in Power Options. This happened last time too and appeared after Windows re-installation. I am posting this just in case the issues are related.)
Here are some screenshots.

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