Re: Header Invalid
bbPress is not a plugin for WordPress. It should not be in your wp-content/plugins folder. It will be installed right along side WordPress, not inside WordPress as a plugin.
Right now you have WordPress installed in a folder called “Blog”. You need to put bbPress in a folder called “Forum” or whatever public URL you want your forum to be known as, and start the installation there.
http://latestartermusician.com/Forum/ is you put it into a folder called “Forum” at the same level as Blog in the directory tree.
It’s not a plugin for WordPress, that’s why you received that error.