Forum doesn't work anymore
 

When I go to my site www.evationstudios.com (forum @ http://www.evationstudios.com/forum/) I get a lot of errors.
I already disabled the plugins with the disable hooks code in the config file. How can I fix this?
At vbulletin.org they say it is because of my server is running PHP 5.3.0.
What should I do?