You should only restore the organisation database(s), and not the MSCRM_Config database. The MSCRM_Config database is deployment-specific.
If you've got a copy of the previous MSCRM_Config database, then just restore that. If not, reinstall CRM, then import the restored organisation database
Microsoft CRM MVP - http://mscrmuk.blogspot.com/ http://www.excitation.co.uk