can't log in after trying to change wordpress url to root

Hello out there in WordPress-land,

I am in a crisis. I was using the Settings General to change the WordPress url to the root from the subdirectory where I built the site and was distracted for a couple minutes. When I came back I had been logged out because of an expiration timeout, and after this I could no longer view or log in to my Dashboard.

I copied the .htaccess file and the index.php from the WordPress subdirectory to the root, per the instructions given on this page: http://codex.wordpress.org/Giving_WordPress_Its_Own_Directory

Then when I still could not view the site or log in the Dashboard, I uploaded my backed up version of the site, which included the above htaccess and index.php modifications.

But I still can not view or log in to the site. Please please help me.

Susan