What error message?
http://myleniumerrors.com/installation-and-licensing-problems/creative-cloud-error-codes-w ip/
http://helpx.adobe.com/creative-cloud/kb/failed-install-creative-cloud-desktop.html
A12... download & install error http://forums.adobe.com/thread/1289484
-more A12... discussion http://forums.adobe.com/thread/1045283?tstart=0
U44.. update error http://forums.adobe.com/thread/1289956 may help
-more U44.. discussion http://forums.adobe.com/thread/1275963
-http://helpx.adobe.com/creative-suite/kb/error-u44m1p7-installing-updates-ccm.html
-http://helpx.adobe.com/creative-suite/kb/error-u44m1i210-installing-updates-ccm.html
http://helpx.adobe.com/x-productkb/global/installation-launch-log-errors-creative.html
or
A chat session where an agent may remotely look inside your computer may help
Creative Cloud chat support (all Creative Cloud customer service issues)