Remove Linux and install Windows 10

I have been using one of my brother computers for about one year with ubuntu. Now my brother want windows back.

I used gparted to format the entire disk into ntfs. I've got an official usb installation of w10. However when i try to boot on it, it's not recognized by the machine. When i go into the boot menu, i don't even see the usb stick.

Any help it's appreciate !