I believe there are a couple of similar threads about CC or CC2014 behaving this way that might give yo some hints, but CS5 is not supported on your OS and may not run properly regardless of what you do. An in-place OS upgrade or an attempt to migrate the application would both be major problems for ID, so if you did either of those things you'll want to uninstall, run the cleaner tool (CS Cleaner Tool for installation problems | CCM, CS6, CS5.5, CS5, CS4, CS3) and reinstall.
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