The video image is stretched. How do I fix this?

A setting in Windows Media Player in Internet Explorer causes the videos to look stretched. To fix the setting 1) Right-click the video player on the Viewing Screen, and choose Options. 2) Under the Performance tab of the Options menu window that appears, click Advanced. 3) Under the Video Acceleration section of the Video Acceleration Settings window that appears, uncheck the setting for Use video mixing renderer and click OK. 4) Click Apply on the Options menu window, and finally click OK to close the Options window. The video should now display normally.