ERROR Warning: Cannot modify header information

Warning: Cannot modify header information – headers already sent by (output started at /nfs/c03/h03/mnt/52741/domains/blog.elliotrock.com/html/wp-config.php:64) in /nfs/c03/h03/mnt/52741/domains/blog.elliotrock.com/html/wp-includes/functions.php on line 698

I have tried to reinstall automatically and then I ftp all new WordPress2.7 files (excluding the database).

Whats wrong? ??