hi.. i'm using Roxio MyDVD to burn video files to watch on a DVD player.. however, when i tried to add this video file into the menu, an error popped out saying 'Could not make a thumbnail. Make sure you have the appropriate decoder installed.' does anyone know what decode ris required and where i can download this decoder? also, is it possible to add this video without the thumbnail image on the menu since i don't have the decoder? any help is appreciated, thanks..