Try following the steps at this TurboTax webpage to activate your product based on your specific Desktop version and operating system.
If you are still hung up at the Activation step:
If after trying all of the options mentioned you still have the same problem:
See this help article and this one for instructions on how to contact TurboTax customer support depending on which product you are using.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"