Windows Movie Maker was one of the best apps in Window XP. Microsoft separated the app from the OS and released a new version as part of Windows Essentials suit. Windows Essentials 2016 still works fine under windows 7, 8 and 10 even though Microsoft discontinued it.
Microsoft has not upgrade the app in many years but plans to release a new version of in the Windows store in the future, but no official announcement yet. The new version will limited to Windows 10. In the meantime you can find some alternative apps that do the same job as Movie Maker. We recommend Ezvid , it’s free just like movie maker was. It’s very easy to use with lots of features. If you’re looking into something a little more advance we recommend DaVinci Resolve also Free with lots of great features.