Windows Movie Maker, part of Windows Essentials 2012, is no longer available for download. Websites that offer free downloads of Movie Maker are not offering the real thing, and those downloads may contain malware, viruses, or hidden costs.
You may want to consider upgrading to Windows 10. The latest version of the Photos app includes the ability to create and edit videos with music, text, motion, filters, and 3D effects. Visit Microsoft Store for more video creation and editing apps.