You can register copies of QuickBooks that have never been registered, or you can reregister previously registered copies (including copies that are now discontinued) online or by phone. If using multiple copies of QuickBooks, you must register each copy that has been installed on every computer.

Step-by-step instructions to install QuickBooks Pro or Premier 2009 using the installation wizard.

Incorrect validation or system unavailable error can occur after entering a validation code. Error can occur because product,license, or validation code is incorrect, or because certain files, system settings, or security settings are incorrect or damaged.

Steps to resolve an invalid license or product number error.