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First, find the windows OS (Operating System) DVD or bootable windows OS USB device.
Attach bootable USB or DVD into your computer.
After step 2 using the function keys (F2, F12 and Delete) enter the BIOS setup.
Then click on Repair Your Computer below the Install Now button.
In Repair Your Computer Open CMD (Command Prompt).
In CMD type “diskpart” then type “list volume”
In list volume, all volumes are shown, then find your system volume where the windows are installed and type “select volume ###“(system volume C) shows on CMD. Ex. select volume 3
After selection of volume, type “ACTIVE“. Your system partition is active now. Type ”exit” to leave diskpart and again ”exit” to close cmd. That’s it now RESTART your computer.