I don’t have easy access to a computer with Windows 7 and screencasting software, but thankfully lots of tutorials are available online.
The 7Tutorials.com site has many useful handouts, including this series on Windows Live Movie Maker.
Also see this tutorial, created by a student in my Fall 2011 section of WRTG 3035: Technical Communication and Design: Creating a digital story in MovieMaker 2
Don’t have Windows Live MovieMaker on your PC? It’s free for Windows 7 users, but you need to download it from this site. Make sure you download it from an official Windows Live site, as there are spoof sites out there that will prompt you to download “MovieMaker” but it’s actually a virus.