Can not access Dashboard after WP 3.5 Upgrade

The answer to your question is located here:

PHP Warning: Missing argument 2 for wpdb::prepare()

Unfortunately that did nothing to bring my site back. My entire website is down and shows both those errors.

I deleted a plugin which allowed me to get the frontend back (for now) but I tried to follow the link directions which did absolutely nothing for my site.

Does anyone else have any ideas? I can not access my dashboard!

In that post which I linked to earlier, there is this text:

First, if you’re a user and you want to get rid of these errors, you should turn off the displaying of errors in PHP. There are many ways to do this, such as in php.ini, .htaccess, etc. For this, you can just put this in wp-config.php. (Note that hiding errors on production sites is good practice anyway.)

@ini_set('display_errors', 0);

Have you done that? Because if you had, then the error display would be turned off and you would no longer see the error message.