In order to troubleshoot this I tried following the directive to use the cleaning tool, so as a first step I have tried to uninstall the CC app however I am getting the message that I must uninstall all of the CC apps, such as Photoshop, InDesign, InCopy, etc. before I can uninstall the CC app. Is this true? None of the online documentation indicates this as a pre-requisite to the uninstall procedure. Thanks.
yes, you must uninstall all cc programs before you can uninstall the cc desktop app. if you decide to do that, do it correctly:
uninstall everything cc including preferences, https://helpx.adobe.com/creative-cloud/help/uninstall-remove-app.html
then uninstall the cc desktop app, https://helpx.adobe.com/creative-cloud/help/uninstall-creative-cloud-desktop-app.html
clean your computer of cc files per http://www.adobe.com/support/contact/cscleanertool.html
restart your computer (don't skip this)
clear your os drive temp and tmp folders. make sure you have read/write permissions for both folders.
reinstall the cc desktop app, https://creative.adobe.com/products/creative-cloud.
if you're unable to install the cc desktop app at this stage, use an administrator account (solution 3 here, https://helpx.adobe.com/creative-cloud/kb/creative-cloud-missing-damaged.html)
use the desktop app to install your cc programs/trials.
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