Windows movie maker corrupted files

Hi, so recently there was a problem with my normal editing software so I had to stick with windows movie maker. I edited the video and then tried to save it. Every time I try to save it, half way through one of the files gets corrupted. I've tried to save it a lot of times, and each time it gets corrupted at around %40 saved. I haven't done anything to the file, I haven't moved it, deleted it, renamed it, or anything. Also the file is an mp4 file. If anyone knows what the problem is, please let me know.

Sometimes you can eliminate problems by opening a file with a particular program, and then getting that program to regenerate/recreate and then save the file. The process of regenerating the file has the effect of cleaning the file, because the program starts from scratch and completely recreates the file from what is shown on the screen.

I have seen this trick work with Adobe Acrobat files. I had a huge document (over 100 pages) that simply would not print. I had Adobe Acrobat Pro, so on a lark, I decided to print the file to Adobe -- that is, to create a new PDF file from the existing PDF file. Adobe then completely recreated the file from scratch, saving the new file under a new file name (I did it that way rather than overwriting the original file). I was now able to open and print the new file.

Perhaps there is a video editing software that will read your video file, then recreate it into a new file. If you save it to a format other than MP4, it will have to recreate it from scratch, because it will have to convert every detail of the file into the new format. I think that is your best chance of cleaning up the file. Once you have cleaned up the file in this way, you should be able to then edit the newly-generated file as needed.

Make sure you make a backup copy before doing this, in case this process corrupts the file even more.