Looked on the internet and this forum and there have been similar problems but I haven't found the fix to this.

When I use Movie Maker on Windows 10, the .mov files from my Nikon camera have a slight hissing sound in the background when played. This hissing continues when the video is saved at high settings, too. This means that it continues to when I upload to YouTube.

I have an example of a video where it is hissing here, skip past the intro and you will hear it: https://www.youtube.com/watch?v=c7NNttHKxN0

Please help ASAP. I really need to get this working for my YouTube videos. Thanks for your support, I hope this issue can be resolved quickly.