Autodesk 3ds Max 2008 License Expiration

Hi,
I just installed Audodesk 4ds Max 2008 full version on my Windows XP SP2 Operating System. The error shows that the license has expired. How can I download this software from the internet without showing such annoying error messages. Please provide suggestion to fix this error as soon as possible. Any help would be greatly appreciated. Thanks in advance.

Your license has expired. You can no longer use this product.
To purchase a new copy of this product, visit Autodesk on the Web at www.autodesk.com.
