I'm new to Ubuntu and I have this Virtual Machine issue when installing Ubuntu.I have done a huge search to overcome this but I failed.So please help me out.
I'm using Oracle VM (Virtual Box) 4.2.14 and I have installed it on Windows 8 (64 bit). Following are the settings.

And when I start Ubuntu, I get the starting screen and screen gets freezes.

Why and how can I start Ubuntu ? Please help me out