ok, so i try to install iwork on my new imac. i bought the suite back when it first came out. and i go though all the intall menu's then when i finally click 'install' a message came up saying "you cannot continue. there is nothing to install" why is it saying this, i put the dvd in there, i deleted the demo that was already there, the dvd says that its full of data....whats goin on?