Step 1: Free download DRM Remove Software --- a powerful DRM removal tool which can strip iTunes DRM license and convert iTunes music video to Google Nexus One. Then install and luanch it, the default settings fit well with your Windows XP/Vista, or Windows 7, no need to make anymore configeration.
Step 2: When come to the main interface, import the DRM-protected media files (like .m4p .wma music, .m4v .wmv video movie) or any kind regular files like .avi, .mov, .mpg, .mkv, .m2ts etc to the conversion window. Since Nexus One plays MP4 best with 800×480 resolution, H.264 codec, 2000kbps, AAC 48KHz 256Kbps, you can find all the parametres needed on 'Settings' board, like Bit Rate, Resolution, Aspect Ratio, and Frame Rate as well.

Step 3: When finish the preceding 2 steps, back to the main window, click the lower-right 'Start' button, when conversion done, you can transfer iTunes music movie to Google Nexus One by manual copying.
* (1). Connect Google Nexus One to computer via USB cable
* (2). 'My Computer' -> Removable Disk icon -> Click to access the Memory SD Card
* (3). Drag and drop the converted files into the right folder of the Memory Card
* Then you can play iTunes music movie with Google Nexus One on the go!