pinoyconsole, I doubt your WordPress got hacked exactly. But your server sure did.
This works fine http://www.wordpressmod.com/readme.html
These gives a directory listing (.htaccess Options -Indexes is your friend)
You really need to lock that down.
Backup all your files and database. Check your wp-config.php and (after you've confirmed that the backup was good!) delete the files that are part of WordPress and those theme and plugins. Re-upload new copies from the sources.
Double check that your .htaccess file is good too and turn off directory listing.
If you can, look at the server logs and try to figure out how they got in. Read and implement stricter file and directory permissions from http://codex.wordpress.org/Hardening_WordPress