Account Has Been Hacked & Hacker Changed The Settings.

Hi

If you have access to your environment, i.e. the server directly, I’d recommend you follow these steps to reset your username: http://codex.wordpress.org/Resetting_Your_Password

This won’t address your security issue, but it will temporarily get you access to your environment. You’ll then want to go about identifying what happened, and getting it cleared out.

Here are some tips to help the process: http://blog.sucuri.net/2012/07/website-malware-removal-wordpress-tips-tricks.html

Tony