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Deactivate on one computer before using your software on another
Before trying to activate on a different computer, deactivate on the computer on which you last used the product.

Important: Uninstalling your product on one computer does not deactivate it on that computer. Explicitly deactivate by following these directions.

Make sure that you are connected to the Internet.
In Creative Suite 4 and 5, choose Help > Deactivate. In Creative Suite 5, deactivate on virtual machines after you finish working on them.
In Creative Suite 3, choose Help > Deactivate to start the Deactivation wizard. When you finish, select Erase My Serial Number From This Computer.
If you uninstalled your software without deactivating, reinstall on the old computer and deactivate. If your old computer is not available, contact Adobe Support.