cant open admin page

[Book]

icant open admin page
after write user name and password anew page open and show page not found
error 404
pleaaaaaaaaaaaaaaaaaaaase

help

[datahell]

Does the language switch option in administration login page works? I guess not.
If you have renamed the admin folder please also do so in htaccess file.

Example:

RewriteRule ^estia/inner.php(.*) estia/inner.php [L]
RewriteRule ^estia/(.*) estia/index.php [L]