If that doesn't work, then go for this one: http://helpx.adobe.com/creative-suite/kb/cs5-cleaner-tool-installation-problems.html
Not exactly the same problem, but might also work for you
-One "drastic" fix for signout problems http://forums.adobe.com/thread/1408331?tstart=0
I (finely) found and installed a new driver for my ATI Radeon HD 5570 display adapter. So far everything is working and without reinstalling CC.