Anyone looking for an alternative to iMovie to download for Windows can certainly consider OpenShot. This is one of the most fully-featured free iMovie alternative programs you can get, well-suited to video editing of all kinds.
It works across all platforms, with support for Windows, Mac, and Linux, and it offers many different features, including trimming, adjusting brightness, altering colors, applying effects, and so on.
You can also use OpenShot to add animations to your video projects and use special effects like slow motion 3D animated titles and additional tracks. It's suitable for use with audio files too and is available in more than 70 different languages.