Look for the "Windows Live Essentials 2012" installer, as Movie Maker was part of that suite.
Windows Movie Maker is a discontinued, legacy program that never required a registration code or product key to function. Look for the "Windows Live Essentials 2012" installer,
If you must use the original version for specific project compatibility (like .wlmp files), you can find safe, archived copies on reputable sites like the or MajorGeeks . you can find safe