If you have moved your installation per our instructions, and upon logging into your installation you are re-directed to your old url, please follow these instructions.
The destination of Clientexec is stored as the 'Clientexec URL' and can be found under Setup -> Settings -> Company URL. Since you are unable to login to your installation, you'll need to edit the database manually.
Login to phpmyadmin or the database tool of your choice, and browse to the 'settings' table. Edit the 'Clientexec URL' to your new URL and 'Save'. Do not include the /index.php or the / . Just simply put http://www.yourdomain.com/clientexec for your domain information.
This will now direct your login to your new installation.