Will reinstalling Windows 10 fix laptop?

My you cousin was messing around on my laptop and managed to delete the hard drive/disk? My laptop shows a black screen that says “Reboot and select proper Boot device or Insert Boot Media in selected Boot device and press a key” I’ve tried different keys but nothing has worked and I can’t get to the boot tab. If I... show more My you cousin was messing around on my laptop and managed to delete the hard drive/disk? My laptop shows a black screen that says “Reboot and select proper Boot device or Insert Boot Media in selected Boot device and press a key” I’ve tried different keys but nothing has worked and I can’t get to the boot tab. If I buy a windows 10 bootable usb will it reinstall and fix the problem?? And what would you suggest to get? Or would bringing it into a Best Buy help??
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