Windows 7 does not come with the version of Movie Maker that came with XP and Vista. If you would still like to use these versions of the software, this video will show you how you can get it, as well as show the very easy install process.
Note* This is the older version of Windows Movie Maker. I would suggest using the new version of the software, which is available through a Windows Live Update. However, this video is intended for those who would rather use this version.
Works with both 32 + 64 bit versions of Windows 7.
Microsoft Download Center Link: