Cannot access admin page

Yesterday I updated my site to latest version of wp (3.9.2) and I still able to access the admin page. Today I tried to access it again but I got an 404 error message. I tried wp-login.php, wp-admin.php, and my alternate login url but no luck.

Are there any way to access the admin page?

Thank You

https://ww.wp.xz.cn/plugins/better-wp-security/