as strange as it may seem I fear it's a challenge for Adobe's Creative Cloud Cleaner Tool.
Sometimes - for whatever reasons - CC doesn't "want" to work. In this case you should CC completely delete and reinstall by help of Adobe Creative Cloud Cleaner Tool. (A try to uninstall by own resources is not enough!)
I quote: ... helps resolve installation problems for Adobe Creative Cloud and Adobe Creative Suite (CS3-CS6) applications. The tool removes installation records for prerelease installations of Creative Cloud or Creative Suite applications. It does not affect existing installations of previous versions of Creative Cloud or Creative Suite applications.
Please use: http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html and follow the prescribed sequence of operations
Sometimes the "opm.db file" is the culprit. In this case you should delete it.
If necessary and for further questions and if "open" please use chat, I had the best experiences.
What error... blank screen, spinning wheel... ???
BLANK Cloud Screen http://forums.adobe.com/message/5484303 may help
-and step by step http://forums.adobe.com/thread/1440508?tstart=0
Mac Spinning Wheel https://forums.adobe.com/message/5470608
-Similar in Windows https://forums.adobe.com/message/5853430
Link for Download & Install & Setup & Activation problems may help
-Comodo Security kills download http://forums.adobe.com/thread/1460361?tstart=0
-Server won't connect https://forums.adobe.com/thread/1233088