http://forum.ait-pro.com/forums/topic/read-me-first-free/
Unable to login into your website:
1. Use FTP or your Web Host Control Panel File Manager and delete the .htaccess file in your website root folder and the .htaccess file in your wp-admin folder.
2. Log into your website and Activate all BulletProof Modes. Or if you are removing BPS do steps 3 and 4 under BPS removal steps.
Note: If doing these steps above does not allow you to login to your website then do these steps:
1. FTP to your website and download this file: /wp-content/plugins/bulletproof-security/htaccess/default.htaccess.
2. Upload the default.htaccess file to your wordpress installation folder (the same folder that wp-config.php is in).
3. Rename the default.htaccess file to .htaccess (removing “default” from the file name).