Reesey,
as was explained above the problem is the configure ID
its trying to use 300 and its already in use

try this

Code:
INSERT INTO configuration_group (configuration_group_id, configuration_group_title, configuration_group_description, sort_order, visible) VALUES ('', 'Quick Updates', 'Here you can configure what you will be able to modify in Quick Updates.', '300', '1');
by using '' rather than an number it will auto increment