For those who are not able to download Windows Movie Maker v2.1, please read the following article:
Windows Movie Maker v2.1. version of Movie Maker is included in Windows XP Service Pack 2 (SP2), which is available via Automatic Updates (Windows Update) on your computer.
However, if you are unable to update to Windows XP Service Pack 2 through Windows Update, click on the link below:
http://www.microsoft.com/downloads/details.aspx?familyid=049c9dbe-3b8e-4f30-8245-9e368d3cdb5a&displaylang=en
Although this download page was originally created for IT Network Professionals, those running Windows XP Home and Professional versions can securely access the download as well.