error when attempting to comment

When ever i anyone attempts to post this error message is displayed:

Warning: Cannot modify header information – headers already sent by (output started at /home/contro7/public_html/wp-comments-post.php:1) in /home/contro7/public_html/wp-includes/pluggable-functions.php on line 194

On pluggable-functions.php line 194 reads
$location = str_replace( array(“\n”, “\r”), ”, $location);

if ($is_IIS)
header(“Refresh: 0;url=$location”);
else
header(“Location: $location”);

I have no idea what this means, haha, any help would be greatly appreciated

Thanks

Steve (controlguru.com)