Resetting and the power goes off before finishing up now asking me to install windows when I pr

I turned it off while the pc was waiting to restart after a reset well now just asks me to install windows when I press ok it just goes to the same thing it just asked me to do how to fix problem anyone
 
Sorry but the message means what it says. You will need a restore from a backup (not just System Repair) or a full install. The primary partition was trashed due the loss of power.
 
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