Error 1146 | Table Does Not Exist Problems

[topianno]

First off, my forum is down. I am running version 4.0.4.

The error messages I am receiving are Error Number 1146, stating that the table doesn't exist. I've noticed this message comes up for several tables.

Does anyone know how to resolve this? I need to get this forum back up ASAP.

Below is an example of one of the error messages...

Database error in vBulletin 4.0.4:

Invalid SQL:

				SELECT *
				FROM session
				WHERE userid = 0
					AND host = '87.118.135.65'
					AND idhash = 'c0906fc6d5e4cf4cf8500a487876e945'
				LIMIT 1;

MySQL Error   : Table 'drkurifo_forum1.session' doesn't exist
Error Number  : 1146
Request Date  : Wednesday, January 18th 2012 @ 10:10:19 AM
Error Date    : Wednesday, January 18th 2012 @ 10:10:19 AM
Script        : http://forum.lapbandsurgery.com/forum.php
Referrer      : 
IP Address    : 87.118.135.65
Username      : 
Classname     : vB_Database
MySQL Version :