Forum Website shot and have no clue
 

I recently just upgraded to 4.0 and I was enabling a few new plug-ins today but accidently enabled VBcredits 3.0 I think. I guess its not compatible. But anyways I have no clue how i can get back into my AdminCP to undo what I did. Any help would be appreciated. Thank you in advance.
Website and error code:
http://www.billievers.com/forums/

Fatal error: Call to undefined method vBulletinHook::init() in /home/p24fpsme/public_html/forums/plugins/credits_plugins.php on line 16