Well, first off, that video is four years old, which is pretty ancient in software terms. SOOO much changes in just a few releases.
So, I have MANY questions: Did your Photoshop installation ever work? Is this problem new? When did it start? What happened between when you last used Photoshop and when the problem arose? Have you tried trashing your preferences? Have you tried reinstalling? What version of Photoshop are we talking about? And which OS?
Shoot me back some answers and we'll get this fixed.