pets install issue i've been playing sims2 on my macbook for a month. no problems. i bought the pets expansion pack. when i try to load it onto my book, an error message appears saying i need to re-install sims2. i've done this twice and i still get the message that sims2 can't be found. could it be something simple as a dvd/ cd rom compatibility issue (sorry about the spelling). i'll try anything
