Unfortunately for that guy, he lost his C drive and, with it, all his files. Not good. I don’t like Windows, but I don’t want anybody to lose data while installing any Linux distribution.
So, without further ado, here’s a step-by-step guide for installing Ubuntu 13.10 on your computer. For most users, that computer will likely be running either Windows 7 or 8, so I’ve used a test computer that’s running Windows 8 Pro for this tutorial.