I have uninstalled the component, but when I was uninstalling I got an error stating I need to manually delete tables so I deleted the tables
_jcp_categories
_jcp_config
_jcp_guest_votes
_jcp_options
_jcp_polls
_jcp_resources
_jcp_users
_jcp_votes
but when I try to reinstall I still get the error 500

500 - An error has occurred.

JDatabaseMySQL::query: 1060 - Duplicate column name 'description' SQL=ALTER TABLE `jos_jcp_polls` ADD COLUMN `description` TEXT AFTER `title`
what other files do I have to delete?? Please Help....