Storyline Crashes When Inserting Video from File

Hi, yes.  I don't even get to the point I can select a video.  As soon as I click to INSERT > Video from File, the dialogue box opens and it freezes the software and my computer. I can't even get to take a screenshot of it for you.  In order to reset I must go to the Task Manager and end the task which closes Storyline.  So I never even get to a place where the video is even selected let alone attempting to load.  What do you think?  Thanks!!! David