You need to have FTP access to your site... You can download your config.php file from your /includes/ directory (/forums/includes/ if your forums are installed in the forums folder)...
You can edit that file and re-upload it to disable all plugins.
If you need the install files again you can download them from your vbulletin members area at vbulletin.com - make sure you download the same version you are using now.
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