Index page error

I tried to update to 2.5.1 but it was not successful, so I delete the new files, re-uploaded 2.5 files and now I cannot get my index.php to show up correctly.

This is the error I am getting:

Warning: main(./wp-blog-header.php) [function.main]: failed to open stream: No such file or directory in /home/gocchin/public_html/index.php on line 4

Warning: main(./wp-blog-header.php) [function.main]: failed to open stream: No such file or directory in /home/gocchin/public_html/index.php on line 4

Fatal error: main() [function.require]: Failed opening required ‘./wp-blog-header.php’ (include_path=’.:/usr/php4/lib/php:/usr/local/php4/lib/php’) in /home/gocchin/public_html/index.php on line 4

I appreciate any advice.