Lost video/project on Movie maker - video editor pro

[Windows Server]

I wonder if you could help me. I a novice and not that great on PC's.I recently crated and finish a family holiday video that I wanted to put on youtube.I have done this previously with movie maker on my old lap top with windows XP.I find the current movie maker confusing.Firstly i completed and saved. I then tried to save the project and keep getting an error code (0x80070070) which is related to storage space.I have a portable hard drive with enough space. I restarted and updated everything and although it go the 3rd and final stage of processing, the error still came

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