You don’t want to burn the whole folder. You want to burn the image file to a disc, not a folder with an image file in it.
A disc image is akin to a .zip file. You want ImgBurn to effectively extract the contents of the image onto the disc so that the files on the disc itself look identical to the way the files inside the image look.
http://forum.imgburn.com/index.php?/topic/61-how-to-write-an-image-file-to-a-disc-using-imgburn/