Sign Out When Sign In http://forums.adobe.com/thread/1450581?tstart=0 may help
-and http://helpx.adobe.com/creative-cloud/kb/unable-login-creative-cloud-248.html
-and 'looping' https://forums.adobe.com/thread/1504792
or
Online Chat Now button near the bottom for Activation and Deactivation problems may help
http://helpx.adobe.com/x-productkb/policy-pricing/activation-deactivation-products.html