Sound will not work on videos in presentation

[Lou Preto]

I have Windows 7 64 bit with Office 2010 with Powerpoint 10
I have designed a Powerpoint Presentation with 3 videos inserted in the WMV format and it works great in my powerpoint presentation.
I did a Save and Send, Create a Video, Computer & HD Displays, Use Record Timing & Narrations, Seconds to spend on each slide 6.00, Create Video
After I do this and play the video....the 3 Videos in the presentation will not play the sound.
Help...I do not know what to do to make the sound work in the Video.