Yes, you can run upgrade.php again. In case it results to an error with "Database access error" then just simply run the following MySQL query:

------------------------------------------
CREATE TABLE `RayShoutboxMessages` (
`ID` int(11) NOT NULL auto_increment,
`UserID` varchar(20) NOT NULL default '0',
`Msg` text NOT NULL,
`When` int(11) NOT NULL default '0',
PRIMARY KEY (`ID`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

CREATE TABLE `RayVideoStats` (
`Approved` int(20) see more NOT NULL default '0',
`Pending` int(20) NOT NULL default '0'
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

INSERT INTO `RayVideoStats` VALUES(0, 0);
------------------------------------------

That should do.