Disk utility won't MOUNT .iso images to disk?

For some reason Disk Utility started only showing a "to erase a rewritable cd or dvd so you can write it again" screen when i click on my dvd drive. I am trying to Mount a .iso file to a disk, It will let me "burn" the files to a disk, but that does me no good. I don't know what i did to mess this up, but i can't seem to figure out how to fix it. I downloaded Virtual DVD drive a while ago and i think it screwed it up. I am trying to mount a .iso file to a dvd to make a bootable disk, does anyone know what my problem might be?