Hi,
Normally, CKForms is a component completely independant of Joomla core (it has its own table in the database). Then if something wrong in CKForms, CKForms doesn't work but Joomla yes.
There is about 10000 CKForms installations without this kind of problem and it's very difficult to me to debug the problem without an access to the joomla installation but I will do my best effort !!!
But before uninstalling or reinstalling something don't forget to backup the joomla installation and database.
Did you try to restart the web server - php server (ask to your host provider).
After uninstalling the component and restart, there is some others messages in the log files ?
Regards
Pierre