I just installed CS5 Design Premium on my older iMac (OS 10.5.8) and the installation seemed to go just fine. However, when I opened Photoshop to try out new capabilities, it crashed with no image open. I was just checking out the various tools. I opened it again with and was trying to edit an image and it crashed again. I've opened InDesign briefly, but didn't try any new files and it didn't crash. Haven't yet opened Illustrator. Photoshop is the program I use most often. How do I stop these crashes?