[h3r0]

According to this (http://www.ubuntu.com/download/desktop/c...on-mac-osx) you need to convert it to a UDRW format image. But according to this (https://sskaje.me/2014/02/create-windows...ve-on-osx/) having a UDRW formatted image will also work on PC. So try the steps in the first link and you should get a bootable usb stick. Also you should verify your boot order (make sure you boot from usb before HDD).