Problem converting mov to avi

[Jeroen van de Nieuwenhof]

I have a quicktime mov file that i want to convert to a file that can be 
used by Windows Media Converter. It's for uploading a video to a 
website. I tried using ffmpeg for this, and used this command:

ffmpeg -i movies.mov -sameq -vcodec wmv3 -acodec wmav2 -f avi 
movies_final.avi

But then i get this error:

Unsupported codec for output stream #0.0

What am i doing wrong and am i using the right options/codecs that 
Windows Media Encoder will probably like best (i know it's pretty picky 
about codecs).

Regards,

KenSentMe