An error with my flow diagram video.

Hello experts,
An error with my flow diagram video. I created a video about flow diagram cases for my upcoming project and tasks, this is like a documentation for my report. I need to fix this as soon as possible for the deadline is fast approaching. Unable to open the video was the error and I need your help to get this issue fixed, the video file is under .mp4 and my operating system is windows XP. Thank you.
