Upgrade Snafu

Something told me not to trust the upgrade and that it would cause extreme issues and it did.

I tried to upgrade to the latest version of WP from the 2.01 (something like that). It did not go over well at all. I have gone through the process to delete and download my BACKUP that I made in the WP admin table. Then I downloaded all the files from my old installation and now I just have a mess. I keep getting these two errors…

Warning: Cannot modify header information – headers already sent by (output started at /home/content/m/a/s/masolo/html/wp-config.php:1) in /home/content/m/a/s/masolo/html/wp-admin/upgrade.php on line 10

Warning: Cannot modify header information – headers already sent by (output started at /home/content/m/a/s/masolo/html/wp-config.php:1) in /home/content/m/a/s/masolo/html/wp-includes/pluggable-functions.php on line 224

Can anyone help me with this? I want my old site back. Is this possible from my BACKUP that I created of my database and using my old files? It also says that I have to download the latest version when I try to access the Admin Panel. Once I do that I immediately get one of the two error messages above. And then the other one comes in.

Thanks for all of your help!!