Fatal Error with 3.0 install and database

Tried to do the automatic upgrade from 2.9.2 WP to 3.0 today in my wp-admin page. I received the message below and the site is down and I no longer have access to the wp-admin page.

Fatal error: Call to undefined function is_multisite() in /home/content/42/5389342/html/hymassage/wp-includes/wp-db.php on line 505

I found the information in my database files from wp-db.php on line 505, it says the following:
PHP5 style destructor and will run when database object is destroyed.
@see wpdb::_construct()
@since 2.0.8
@return bool true
function_destruct() {
return true;

Honestly, I have no clue what action to take based upon that message. I tried restoring my database (I back it up weekly), but still receive the same fatal error message.

Any ideas on how to resolve?

Thank you,
Oliver