I would uninstall and reinstall. It's not supposed to be hard so probably something is wrong with the installation. Although I have had trouble with the launchers themselves. But
you should be able to still run it with comand line or Nautilus.
Also, you do not need to be root to run it. Being root makes it way too easy to corrupt things. Be just a normal user whenever you can, which is just about all the time except when you're installing something.
Also, also, when you reinstall it do so from some official repository, not say something line a Chrome website. This will eliminate a lot of difficulties in installing software. In Ubuntu it's -> Dash Home -> Software Center, all from the gui.