It sounds as if you might have a bad CD. Did you burn the CD s-l-o-w, 4X - 8X, in a RAW mode? RAW modes are usually listed as SAO, TAO, or DAO.
After the burn is complete check the MD5 sum of the burned CD against the one published on the Mint download site for that version.
At least that would be my first guess anyway.
Insanity: Doing the same thing over and over and each time expecting a different result.
Democracy is 2 wolves and a lamb voting on the menu. Liberty is an armed lamb protesting the electoral outcome. A Republic negates the need for an armed protest.