I had my "movie" almost complete using photos and videos.  Audio in videos played fine until last night and now NO audio!  I need this project for tomorrow and

don't know what to do.  Can anyone help?  Don't have time to do in a new program.  There MUST be a fix!

I did notice when I loaded my last videos that some showed the caution pic.  I deleted those frames.

Using Windows 8.

Maddening that I cannot contact Microsoft tech support - too many hoops to jump through and when you think you're finally there, NO!  Wasted over an hr. just trying to contact them about a problem with their program!

PLEASE help!