Try the following troubleshooting steps in the order provided. If the first solution doesn't resolve your issue, perform the next and try again, and so forth.
If you lack administrator access privileges, then Adobe Creative Suite may be unable to access necessary files. To determine if limited privileges cause the problem, log in as a user with access privileges, and try to recreate the problem. If the problem doesn't recur, then the account you were previously using lacks access privileges. Contact your system administrator to grant you access privileges.
See "Log in as a user with administrator privileges (Mac OS X)" (TechNote kb404926) for details.
Occasionally, a user account can become corrupted and prevent the installer from accessing or creating the necessary files and folders. Create a new account, log in to the new account, and then try to install or run the Adobe application.
See "Repair disk permissions by running Disk Utility (Mac OS X)" (TechNote kb404928) for details.