formatter 'Slideshow' and 'cck-slideshows' doesn't not exist

hello. here is new bugs from a french drupaler...

1--->under the 'Teaser' or 'Full' drop down select for your imagefield, choose the formatter 'Slideshow' :
-->I haven't the formatter 'slideshow'. I just have a blanc.

2--->Go to admin/content/cck-slideshows :
-->The page exist, but nothing inside.

Thank's