to view them, i would use anything but wmp. try media player classic. if it doesn't display it correctly use the option view/video frame/override aspect ratio/16x9. the camera must not set he wide 16x9 mpeg-2 flag correctly or the programs would play them wide.
i've never used wmm but in most editors you can set the source material specs by right clicking on the file in the editor and selecting properties. change the 4:3 setting to 16x9.