i tried to remove the whole address information in registration form (title,firstname,lastname,street etc) but can't seem to get it right yet. could you point to me exactly all the files that i need to edit? maybe i've missed something. thanks
You don't need to edit any file. You can just go in the menu Display->Custom fields and unpublish the fields there. If you need to change the texts on the view, you can also override the translations via the interface in the config under the tab languages:
www.hikashop.com/download/languages.html#modify