Multi language problem

Hi, i’ve a website in italian. Since i need for a english version, and since there are not many pages nor i need to update it periodically, i opted for another install. Also i wanted to clone it and then change textes and links. So i went to cPanel, to wp installer, and cloned my old installation (in root) to /en folder. Also set en db. Now i have my domain.com working properly, but whenever i go to create a page, after have written everything and updating, i get page not found. The homepage of english version (domain.com/en) is working properly, but whatever page i create, i get page not found as result.

Any idea?