I have hard to belive that your problem has anything to do with moho, as the help is a simple html-file(s). The problem probably has to do with your ie.
The 2 things I can think of are either you have javascript disabled or perhaps your quicktime or flash plugins are not quite right. But like Hiddicop, I would tend to place the blame on a broken IE installation. You might try running some spyware checks to see how hacked your IE is, its not hard to break.