Have had to reinstall my CS3 Design Premium suite but Photoshop refuses to install all the others are fine, I'm on Mac OS10.5.8
Try to run CC Cleaner and install again
CS Cleaner Tool for installation problems | CCM, CS6, CS5.5, CS5, CS4, CS3
http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html
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