wp-config.php issue

I’ve tried to install WordPress and the moment that I uploaded the wp-config.php file I got a “headers already sent” error. Everything was working perfectly though, so I carried on with the setup. Now the homepage works great, the only problem being that I can’t get to the admin page. At the top of the login page I get the following error:

Warning: Cannot modify header information – headers already sent by (output started at /home/www/free/uv.ro/puzzledomino.uv.ro/wp-config.php:1) in /home/www/free/uv.ro/puzzledomino.uv.ro/wp-login.php on line 338

Warning: Cannot modify header information – headers already sent by (output started at /home/www/free/uv.ro/puzzledomino.uv.ro/wp-config.php:1) in /home/www/free/uv.ro/puzzledomino.uv.ro/wp-login.php on line 350

After I hit login I just get a white page with only this written on it:

Warning: Cannot modify header information – headers already sent by (output started at /home/www/free/uv.ro/puzzledomino.uv.ro/wp-config.php:1) in /home/www/free/uv.ro/puzzledomino.uv.ro/wp-login.php on line 338

Warning: Cannot modify header information – headers already sent by (output started at /home/www/free/uv.ro/puzzledomino.uv.ro/wp-config.php:1) in /home/www/free/uv.ro/puzzledomino.uv.ro/wp-login.php on line 350

Warning: Cannot modify header information – headers already sent by (output started at /home/www/free/uv.ro/puzzledomino.uv.ro/wp-config.php:1) in /home/www/free/uv.ro/puzzledomino.uv.ro/wp-includes/pluggable.php on line 669

Warning: Cannot modify header information – headers already sent by (output started at /home/www/free/uv.ro/puzzledomino.uv.ro/wp-config.php:1) in /home/www/free/uv.ro/puzzledomino.uv.ro/wp-includes/pluggable.php on line 670

Warning: Cannot modify header information – headers already sent by (output started at /home/www/free/uv.ro/puzzledomino.uv.ro/wp-config.php:1) in /home/www/free/uv.ro/puzzledomino.uv.ro/wp-includes/pluggable.php on line 671

Warning: Cannot modify header information – headers already sent by (output started at /home/www/free/uv.ro/puzzledomino.uv.ro/wp-config.php:1) in /home/www/free/uv.ro/puzzledomino.uv.ro/wp-includes/pluggable.php on line 866

I’ve checked wp-config a million times for missing single quotes the php closing tag. It still doesn’t work. Can someone help me, please? I need to get the site up and running as soon as possible.