The path in the error messages appears to point to your local hard drive which, obviously, isn’t accessible from the public web server where the site is stored. So, you either need to change something in your editor program or edit the paths manually.
And with the error 404 this means that a file is missing or not of the name you typed into the browser’s address bar. What is the URL for the admin page and can you confirm that file is present?
Donít click this link!