I am unable to save a movie in MP4 format, or publish it - above error code appears.  I am using .jpg slides (exported from Power Point) and a .wav audio file - total length 3.07 mins, combined video and audio files approx. 80MB. 

The movie will save in .wmv format but this is not exportable to YouTube - to publish the movie, I see no other file format than the default MPEG - 4/H.264.

The same error message appears without audio file - I have tried .png format for the slides but same error.

I have already successfully published 4-5 videos on YouTube two months ago but I cannot do so now, since an upgrade from Windows 8.1 to Windows 8.1 Pro in early Feb. (which was done to fix a Windows Media Player problem), but not sure if that's relevant.

I have tried to save the move with custom file settings to match audio and video file sources but also no joy.