Are these the files you downloaded and installed?
BTW -- We don't recommend Ubuntu for beginners.Linux Mint 13
(LTS, based on Ubuntu 12.04), which is supported until April 2017, is much easier for beginners.
Ubuntu 13.10 is only supported until July 2014
(4 months from now).
Mint offers 4 different desktop environments. MATE is my favorite, but everyone has their own preference.