This sounds suspiciously like a bad cd. Did you burn it s-l-o-w, 4X no faster than 8X, and in a RAW mode? RAW modes are usually listed as SAO, TAO or DAO. Did you check the MD5 sum of the burned iso cd against the one posted on the Mint download site?
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.