Fatal Error and WordPress 3.7 Installation Fail.

After installing the latest version of WordPress I get the following error messages:

Downloading update from https://ww.wp.xz.cn/wordpress-3.7-no-content.zip…

Unpacking the update…

Verifying the unpacked files…

Preparing to install the latest version…

Warning: md5_file(/home1/cnewshub/public_html/wp-cron.php) [function.md5-file]: failed to open stream: Permission denied in /home1/cnewshub/public_html/wp-admin/includes/update-core.php on line 709

Warning: Missing argument 3 for wpseo_upgrader_process_complete() in /home1/cnewshub/public_html/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php on line 259

The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.: wp-cron.php

Installation Failed

Now when I click to open a post, I get this message:

Fatal error: Class ‘WP_Date_Query’ not found in /home1/cnewshub/public_html/wp-includes/query.php on line 2303

And this one when I try to log into the site:

Fatal error: Cannot redeclare check_password_reset_key() (previously declared in /home1/cnewshub/public_html/wp-login.php:281) in /home1/cnewshub/public_html/wp-includes/user.php on line 1642

Whilst logged in I received the following error message when accessing the updates page:

Parse error: syntax error, unexpected ‘}’ in /home1/cnewshub/public_html/wp-admin/update-core.php on line 1003

I can now no longer access the dashboard or log into the site at all. I have disabled the plugins via FTP, but that has not resolved any of the issues.

Any ideas or suggests on what to do are most appreciated!!