short and sweet answer; you can't itunes uses a format only ipods and itunes can read. You can buy converters.

ou can try the best DRM remover software which could legally remove any DRM WMV/WMA/M4P/M4V/M4A/M4B/ASF protection and convert iTunes video, music, movie and other popular video & audio even HD video. With this powerful DRM remover, you can customizable output profiles with your own style.

The All-In-One software provides you DRM remover, video converter, audio converter, video to audio converter and HD video converter. The output files of finicky formats can be played on all popular digital media player: iPod, Creative ZEN, Zune, iPhone, PSP, Archos and other MP3/MP3 players.hey might be formats that arent supported by movie maker
you can try dragging and dropping from your itunes library to wmm...idk if it will work though.
or you can download converters...