low quality of the image on Youtube

Jun 7, 2011 at 4:09 PM

I use Umusic with Windows 7 to post on Youtube only one picture .jpg and a song in .mp3. The video .wmw, when it becomes posted on Youtube, has a TOO WIDE picture, i.e. its width is greater than the width of the original potograph (image's distortion). How can I do? Thanks.