Manjaro dual boot installation

First of all I am a BEGINNER. I ran into a problem (error: you need to load kernel first) and it seems there is no solution, so I will reinstall manjaro.
I have a dual boot (windows 10 + manjaro) setup is there is any way to reinstall manjaro without losing data.
If there is such a solution would you please guide step by step because as I mentioned earlier I am a BEGINNER.

“excuse me for my bad English. I’m not a native speaker”

Even beginners can search before asking.

Search for reinstall without loosing data or repair grub or repair system chroot

See the wiki at https://wiki.manjaro.org or the forum archive at https://archived.forum.manjaro.org

Closed as duplicate and lack of own research.

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