911! Fix errors with Magento

I attempted to install a Magento extension and I messed up my site very badly. I tried to overwrite the files with a new Magento installation and this is the error I currently see on my website: There has been an error processing your request dbModel read resource does not implement Zend_Db_Adapter_Abstract Trace: #0 /var/www/vhosts/[login to view URL](134): Varien_Data_Collection_Db->setConnection(false) #1 /var/www/vhosts/[login to view URL](1350): Mage_Core_Model_Resource_Db_Collection_Abstract->__construct(Object(Mage_Core_Model_Mysql4_Website)) #2 /var/www/vhosts/[login to view URL](1386): Mage_Core_Model_Config->getModelInstance('core_mysql4/web...', Object(Mage_Core_Model_Mysql4_Website)) #3 /var/www/vhosts/[login to view URL](460): Mage_Core_Model_Config->getResourceModelInstance('core/website_co...', Object(Mage_Core_Model_Mysql4_Website)) #4 /var/www/vhosts/[login to view URL](208): Mage::getResourceModel('core/website_co...', Object(Mage_Core_Model_Mysql4_Website)) #5 /var/www/vhosts/[login to view URL](213): Mage_Core_Model_Abstract->getResourceCollection() #6 /var/www/vhosts/[login to view URL](598): Mage_Core_Model_Abstract->getCollection() #7 /var/www/vhosts/[login to view URL](456): Mage_Core_Model_App->_initStores() #8 /var/www/vhosts/[login to view URL](342): Mage_Core_Model_App->_initCurrentStore('', 'store') #9 /var/www/vhosts/[login to view URL](640): Mage_Core_Model_App->run(Array) #10 /var/www/vhosts/[login to view URL](80): Mage::run('', 'store') #11 {main} Error log record number: 788761441585 Please contact me if you know how to fix this problem. I will also have many other jobs to do after this one gets fixed including installing 3 extensions, Google Shopping feed, and other layout fixes. If you fix my site, I will give you first offer to doing the other tasks.