Wubi is an officially supported Ubuntu installer for Windows users that can bring you to the Linux world with a single click. Wubi allows you to install and uninstall Ubuntu as any other Windows application, in a simple and safe way. Wubi is Simple, No need to burn a CD. Just run the installer, enter a password for the new account, and click "Install", go grab a coffee, and when you are back, Ubuntu will be ready for you.
Wubi is Discrete
Wubi is Free