Get wordpress site back up and running, then move it from sub-folder to root folder

Hi There, I'm looking for someone available right away to help restore my wordpress site and move it to the root directory. The whole thing was up and running but now it's totally down and someone is waiting on it so I need it up ASAP (I've already tried myself about 6 hours and am now desperate. After attempting to move my site from a subdirectory ([login to view URL]) where everything was up and running perfectly to the root folder — now I have no Dashboard access and the site is down with a '500 Internal Server Error.' After attempting to move my site from a subdirectory ([login to view URL]) where everything was up and running perfectly to the root folder. Originally I tried following instructions here for "Using a pre-existing subdirectory": [login to view URL] The problem started because in Settings->General (back when I still had dashboard access) I accidentally changed the "Site URL" not to include /wordpress. I have no access to dashboard and the site [login to view URL] (itself give a 404 Internal Server Error So far to fix it, I've tried the following on my own: • Creating a new .htaccess • Adding to the [login to view URL] file update_option('siteurl','[login to view URL]'); update_option('home','[login to view URL]'); • Editing [login to view URL] from Changing_The_Site_URL. (Unfortunately i don't have access to a database backup). I would really appreciate any one who's willing to help. Thanks!