Wubi – Ubuntu installer for Windows
Everyone who have installed Linux will know how confusing it is sometimes. Wubi is an unofficial Ubuntu installer for Windows users that will bring you into the Linux world with a single click. Wubi allows you to install and uninstall Ubuntu as any other application. If you heard about Linux and Ubuntu, if you wanted to try them but you were afraid, this is for you.
Official Website :http://www.ubuntu.com/download/desktop/windows-installer
Follow the steps here to Install Ubuntu Installer for Windows