ok IMO youve ripped them wrong way,
what you have done is taken an image of the whole c.d and if you want to play them you will need powerISO or daemon tools.
research those but what you should of done because it takes up less space and there easier to play is rip them to .avi files, do some research on this also an .avi file is about 700MB and a full DVD ISO usually bout 4,000Mb