Unfortunately, Windows Movie Maker doesn't support to import MOV files. The only files that you can import are: .asf, .avi, dvr-ms, .m1v, .mp2, .mp2v, .mpe, .mpeg, .mpg, .mpv2, .wm, .wmv, .aif, .aifc, .aiff, .asf, .au, .mp2, .mp3, .mpa, .snd, .wav, .wma, .bmp, .dib, .emf, .gif, .jfif, .jpe, .jpeg, .jpg, .png, .tif, .tiff, and .wmf. For further information, you can check Windows Movie Maker frequently asked questions. As an alternative, you can use Sothink HD Movie Maker, ImTOO Movie Maker, or Xilisoft Movie Maker. All of them are easy to use and supports to import .mov files.