Sorry, i don't understand your reply. Do you mean that you have formatted the computer but get the same error ? This error won't be solved reinstalling.
A single Forest license must be used and authorized only on a single computer. If you change the hardware or reinstall Windows, then it must be reauthorized. The software allows you to authorize the license automatically until five times, that must be enough for a long time... but you have exhausted the five authorizations in only a few days.
Have you installed the license in more than one computer ?