Am trying to trim a Mp4 video file in the moviemaker of 

The Mp4 file will not upload (transfer) into the moviemaker.  it only uploads the audio.

Then Mp4 file opens everywhere else.  Other Mp4 files do not upload in the moviemaker either (again, just the audio)

Am trying to trim video to re-insert in a PowerPoint presentation (version 7).  I understand that later versions of PowerPoint have the trimming feature included (is this true??), but for now I am stuck with this version and have to turn in the presentation in a few hours!!  (yes, I procrastinated)...

Can anyone help me?  I just chatted with the Microsoft "technical" support people who are of no help and want 145 USD for paid support for something that should be straight forward, right?