Please\can someone help,this is driving me crazy.I have just purchased an external DVD burner that is compatible with both the + & - format.I have also purchased a DVD player that plays both of these formats.I have just burn a movie to a DVD-RW disc,but when I put it in my DVD player,I get a disc error message.I must be doing something wrong,but I do not know what.The movie I burnt to the disc was an AVI file.Do I have to convert my files into a different format before burning?