[Rails] Rails server not starting

Hello, Im currently having troubles getting my rails server to start. I was working on it fine yesterday, but now it seems like it isn't working at all. These are the errors i get when i try and start the server up, C:\Users\Tristin\treebookrails server C:/Program Files

[Rails] Re: Rails server not starting

Okay this is what happened after typing the above, C:\Users\Tristin\treebookgem list rails *** LOCAL GEMS *** C:\Users\Tristin\treebookgem install rails ERROR: While executing gem ... (Errno::EACCES) Permission denied - C:/Program Files (x86)/ruby-1.9.2/lib/ruby/gems/1.9.1/ge