Hi David,
It appears as though you have already posted the same issue in the Download, Install, and Setup forum, which is the correct place to get assistance for these kinds of issues with Adobe Creative Suite (e.g. CS5, CS6, etc.) and Adobe Creative Cloud (CC).
https://forums.adobe.com/thread/1725424
You might also see this article from our knowledge base, or search through it to find some help:
https://helpx.adobe.com/x-productkb/policy-pricing/configuration-error-cs5.html
Kind regards,
- Carey