How do i change video format to WMV from windows movie maker?

i have made a video to go on windows movie maker and i need to put it on youtube A.S.A.P but it says i need to export and format the video to an WMV can anyone tell me how to do that in a easy simple way for a windows vista please help mee:(|||Finish movie %26gt; save to my computer|||all you have to do is either add it to your videos and use WMV as your default media player or drag it from what you use now over to WMV. I usually lay them side by side or with WMV underneath and then drag it over. That should be all you need to do to get it to play on youtube. Hope this helps.