You obviously can't fit the data from a DVD on a CD, but you should be able to make a disk image of the DVD (on a computer with a DVD drive), copy it on the target computer, and 'restore' it onto a partition which you can boot from to do the install on the rest of the HD. This makes for a much faster installation also (though an external drive would be fastest) (As I realized Waragainstsleep already said above - shouldn't type this late at night!).