Windows Movie Maker / Windows Live Movie Maker
For Windows XP and Vista, Windows Movie Maker is pre-installed. For Windows 7, Windows Live Movie Maker is pre-installed or you can download it for free. The two programs are almost exactly alike with a few changes to the menus.
In Windows Movie Maker, go to File and choose either Import Media Items or Import into Collections. Choose the video you want to convert and press Import.
In Windows Live Movie Maker, press Add Videos and Photos from the ribbon menu. Choose your file and select Open.
Drag and drop the video file to the storyboard at the bottom of the screen. In Windows Live Movie Maker, the video is automatically added to the storyboard on the right side of the screen. You can reorganize files if you choose to combine several video files.
Go to File and choose either Save Movie File or Publish Movie, depending on your Windows version. In Windows Live Movie Maker, select the File icon, which is over the paste button and choose Save Movie File. Choose the location to save the file and file type to save the video as. Choose any of the support formats.