My little brother received a game called 'Spore' and when I click on the disk to install it, what shows up is the title, and distorted graphics, as well as the install icon. I click the icon and nothing happens. My iMac also will not allow downloads and the following warning will show: "Not enough disc space" when There is about 185.5 GB available. Also, when I want to play the Sims 2, when I click on the icon, [the disk is in] the icon bounces on the dock, and then disappears. The game won't even open. I am in desperate need of advice. Please help! 