Fix Magento Database issues

We have a Magento database we've imported products into using Micco Solutions product importer. We have some database errors with foreign keys. Basically it's not allowing us to add items to the cart. We have an old 1.5 Magento site running live and a 1.9 dev site which we are importing the products into, so the current data is available. Need the errors fixed (plus a few more but this one is urgent) Basically here's the error Error #1005: Can't create table 'name removed' (errno: 121) on SQL: ALTER TABLE `catalog_product_entity` ADD CONSTRAINT `FK_CAT_PRD_ENTT_ATTR_SET_ID_EAV_ATTR_SET_ATTR_SET_ID` FOREIGN KEY (`attribute_set_id`) REFERENCES `eav_attribute_set` (`attribute_set_id`) ON DELETE CASCADE ON UPDATE CASCADE Need someone who can fix this, please only bid if you are absolutely sure you can fix this and quickly. We need to get the site live. As mentioned there are a few other database repairs which we will detail but they don't look too bad. Again only bid if you can fix this and quickly. Thanks, please ask any questions if in any doubt.