Try creating a new user, and see if you can launch your applications there. You may have accumulating files in your current user which are keeping the CS5 apps from installing. Running in a new user may get around that problem.
If you have installed earlier versions of Creative Suite, you can use the Adobe Cleaner tool to remove components from past versions: Adobe - Adobe Creative Suite Cleaner Tool
Reinstalled os10.8.1, removed and cleaned CS5, created a new user, problem not corrected
main problem is CS apps (except bridge) hang and are unresponsive if they sit in the background for any length of time
.Indd is the most unstable, generates ( cannot undo command), hangs several times a day
also running Suitcase Fusion 3
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