If you installed the wrong plugin (usually unsupported or mis-configured but also malicious plugins) and got the dreaded blank screen of death with errors, don’t panic. Even though the Admin panel may not work, there’s still a emergency solution by executing one simple query in the database.
Simply execute this SQL query (perhaps through PHPMyAdmin):
// WP 2.9 and earlier
UPDATE wp_options SET option_value = '' WHERE option_name = 'active_plugins';
// WP 2.9 and later:
UPDATE wp_options SET option_value = 'a:0:{}' WHERE option_name = 'active_plugins';
Alternatively, if it’s not possible to change the database, you can also simply rename the /wp-content/plugins/ folder to disable all plugins.
This will disable all plugins in the WordPress installation. Rename it back after.
You just have to go back and enable all the working plugins and deleting the non-functional one.
