Did you remove the entries in your .htaccess file that are required for this module to work?? Sounds like the Ceon entries are still in place in your .htaccess file.. Rollback your store to the pre-install state, and you should be good to go..
Going forward you ALWAYS want to back up your store and the database before installing modules.. This way you have a fallback position when you have issues or want to uninstall.. Never install another module before fully testing that the module you have installed is installed correctly and is working completely as it should..
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