There is no Wubi anymore for 13.10 and will not be for future versions.
Also, Wubi it was not used to install Ubuntu to replace Windows, but to coexist for people that want to test and not alter their partiction scheme / filesystems.
You need to boot the normal installation/live version and choose to remove Windows and install Ubuntu (it will be one of the choices).
To install Ubuntu (the way you mentioned and the official way) please download Ubuntu from the official link, burn it on a DVD or make an USB stick with Pen Drive as the official docs recommend for USB install.
Reboot your computer and start from DVD/USB and follow the install procedure which is only a few simple questions asked.
Also the documentation has everything covered about the installation, it's not useful to reproduce them on other sites. Ubuntu Desktop Installation Documentation.