Take a look at the most common questions
Compilation and Protection options and features
Excel specific questions
Error messages, bugreports
The most likely you've selected manual activatoin opion. This error may have such reason:
If you've entered wrong Computer Name, you need to do the following:
If you see that key was created for wrong product - create another key for the product you need.
If you can't solve the issue yourself, please contact our support.
We suggest to use on-line activation option.