Some people would like to install just movie maker from the suite of "Live" programmes, heres a very easy way how.
Run the installer from this page
http://download.live.com/moviemaker
During the installation process you will have the option to uncheck the items you do not want. Uncheck everything but Windows Live Movie Maker and complete the installation.
Once this is complete you will have a Windows Live Movie Maker only installation on your computer.