Maybe misunderstood your question, but I'm pretty sure if you deactivate the key before you uninstall then it won't automatically pick it up again when you re-install.
The first link will solve your problem.
Here are the links:How to Uninstall/Remove Tableau Desktop Completely Off Your PC
Thanks for your time,
but my problem is a little more complex ....
Thanks for your time...
your answer helpe a lot..