Windows Movie Maker is a basic video creating/editing software introduced by Microsoft. It contains features such as effects, transitions, titles/credits, audio track, timeline narration, and Auto Movie. It can only accept video files in format AVI,WMV, MPEG, ect. So, if you want to edit your DVD video in Windows Movie Maker, it is better for you to convert the video format to WMV or AVI first.
Please download Daniusoft DVD ripper, install and run it. It is one of the best DVD Converter, which can help you rip DVD to almost all video and audio formats. Then we can finish the conversion in 4 simple steps:

Step 1: Import DVD files.
You can either click Add button to insert the files you want to convert,or easily drag & drop the DVD files into ‘Getting started’ table. You are allowed to load DVD Rom, DVD folders, ISO files or IFO files respectively.
Step 2: Customize output settings.
Click the "Convert to" drop-down menu to select the output format. You can choose WMV or AVI format. Also, you are allowed to customize the output parameters by clicking “Settings” button .Then click the "Target Path" button to find the destination folder for saving output format, or the files will be saved as default. A regular DVD movie has multiple subtitles and audio tracks, and you can select the right one for you.
Step 3: Edit video files.(optional)
Click “Edit” button, you are allowed to make wonderful video editing by cropping, trimming, adjusting effect and editing watermark.
Step 4: Start conversion.
Click “Start” button on right bottom of the main interface, you are allowed to start conversion. All the tasks of conversion will be finished at fast speed and high output quality. You can view your converted files by press the browse button, or you can choose to turn off computer after conversion.
After you get the output video clip ripped from the DVD, you can import them to Windows Movie maker to edit. Have fun.