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)
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
Thanks! Will try. But before I do, what effect does this have on any plugins or saved presets? I'm assuming this will erase any of that data and this will require me to start from scratch?
it will reset your preferences and you should be prepared to restore your plugins (but that usually is not needed). you can copy your preferences for quick restoration, if you want.
Thanks! Followed your instructions and it seems to have solved the issues I was having. Much appreciated.