Re-install sliComments

[edjorura]

I install slicomment and uninstall folder by folder, now I want reinstall sliComments y said me:
Plugin Instalar: Plugin plg_content_slicomments ya existe
Plugin Instalar: Plugin plg_slicomments_akismet ya existe
Instalar componente: Las funciones de la base de datos, no reportan ningún error

I erase all files con phpMyAdmin and again said the same thing.

What can I do?

[jonnsl]

try to run this query on phpMyAdmin

DELETE FROM `#__extensions`
WHERE `name` = "com_slicomments" OR `name` = "plg_content_slicomments" OR `name` = "plg_slicomments_akismet"

and

DELETE FROM `#__menu` WHERE `name` = "COM_COMMENTS"

Don't forget to replace #_ with the prefix of your joomla installation.
Then try to re-install.