I use Windows OS and I want to install Ubuntu on another PC.
- Download software for bootable usb creation http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/
- Download ubuntu image from http://www.ubuntu.com/download/desktop
- According to instructions from http://www.ubuntu.com/download/desktop/create-a-usb-stick-on-windows install image on usb stick
- use usb-stick as bootable