I’m not talking about this one, i’m talking about the one that is at the root dir of your web site. So don’t paste it here !!
Maybe you can do a dummy install on your computer using MAMP, WAMP or XAMPP and see if it’s working and analyze the root .htaccess file and the owner/permissions of the folder buddydrive compare to what’s on your website.
What i would do if i were you : i never work on a live server, i prefer to check on localhost before. So i would copy all your server config (all files and folders, all .htaccess files, and the complete database. Then i would create a vhost on my local computer and force the dns of my hosts file and then search what’s going wrong…