Vague. Please describe the error.
These tutorial videos are hosted at YouTube, correct ?
(Please provide a link when you encounter broken videos.)
okay, you went to this page: http://www.sketchup.com/learn
... and clicked on the "Get Started" button, ...
... which brought you to this page:
(with the 4 "Getting Started with SketchUp" videos)
I just tried them and they all worked fine for me.