Just thought I'd post this as a service to others. I was having trouble installing bbPress on my website http://www.getfiterator.com which was hosted by GoDaddy.
You must change the line in the config.php file that says:
define('BBDB_HOST', 'localhost'); // 99% chance you won't need to change these last few
You must enter the correct hostname. You can find information about how to find the hostname for your database at the following link:
http://help.godaddy.com/article/39
Hope this saves someone some time ( it sure would have saved me some)!