Help – WordPress Hacked

Hello,

I’m running a rather successful blog with over 5000 uniques every day, last night it was hacked. I’m currently competing in a contest and after getting spammed with nasty comments yesterday night from another contestant, I woke up this morning to find my blog down.

I would need your help asap please!

The Problem:
When opening the blog / or admin panel it only redirects to my blogs adress/wp-admin/install.php

What I did so far:
– I have checked my DB and all tables seem to be still fine, in any case I run backups every 3 hours so that should be ok.

– the .htaccess file looks fine as well

I’m totally helpless, can someone please let me know what I need to fix to bring my blog back up?

Cheers and thanks!
ElPatre