Those are all due to plugins. You were supposed to disable all your plugins prior to upgrading.
Try disabling your modifications/plugins and see if you still have this problem.
Note: To temporarily disable the plugin system, edit config.php and add this line right under <?php
PHP Code:
define('DISABLE_HOOKS', true);
Also, please read this -
Installation Issues / Questions or bug reports regarding default vBulletin 4.0