Windows Live can host your finished movie at Microsoft Soapbox, enabling your friends and family to view it from their Web browsers. But if you already have a YouTube presence, you can add a plug-in called LiveUpload to upload to that site from within Movie Maker.

Visit the page, and click Download Now to grab the plug-in. Save and run the file, following the installer's instructions; the installation takes just a few seconds.

Restart Movie Maker, open the Home tab if needed, and press the bottom half of Publish. (Click on the word or below it.) Select LiveUpload to YouTube. Enter your username and password, and click Sign In. Enter a title, add a description, and complete the other details; then click Publish. Movie Maker will prepare the movie and upload it to your YouTube account. The process may take anywhere from several minutes to more than an hour, depending on the length of the video.