What to do: Reboot and Select Proper boot device appears

Nov 3, 2018
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I have Asus x200M and i was about to reformat it in windows 7 using usb. When i was in the disk partition, windows cannot install it in the selected disk because of "GPT style" so i run cmd and disk part to convert it from GPT to MBR, still cannot install the windows and i accidentally cleaned the disk 0

Reboot and select proper boot device keeps on popping, can someone help me, how can i bring the disk partition back