Movie Maker has been the most amazing utility which comes by default loaded with windows both in windows xp and vista. Windows Movie Maker also comes with windows live pack which has movie maker beta which is not so powerful in terms of features.
Movie Maker which comes in built with windows provides these features including recording video from your Digital cameras, handy cam etc, adding text and effect in the video, import video to edit, add titles and credit etc.
Here are the links to download different versions of movie maker with some what feature variation.
Note: If you are confused in the above links, we would suggest you to download the newest version 5.1
You can also download this version of windows movie maker which comes with windows xp service pack 2
Moreover, A contributor "Devrexster" @ WinMatrix has also created a portable version of Windows Movie Maker 2.6 which works with Windows XP, Vista and Windows 7 , you can download from the link given below.