Here is another short simple post of something I had to figure out and could not find documented anywhere.
Problem: When install the Symfony MVC on my localhost (Windows Vista), I would copy-paste the additional httpd.conf settings to the httpd.conf file in the xampp folder. When I would restart Xampp (or apache more specifically) I would get a windows error telling me that Apache had failed to start properly.
Solution: Although I had switched the paths to be specific to windows, I did not know until reading documentation later that the apache still requires all backslashes to be forward slashes in the file paths.
Simple mistakes, but now solved.