The product key for Windows Vista Ultimate can be found on the Windows Vista CD sleeve or on the CD case. Users must have this key to be able to activate Windows.
As of 2011, Windows Vista with Service Pack 1 is no longer supported by Microsoft. Users running this operating system will need to update Windows to include Service Pack 2 to take advantage of the operating system's security features. This should not interfere with the computer's activation. However, sometimes, machines that came preloaded with the Windows Vista operating system will automatically prompt the user to activate the machine again. To combat this problem, users will not need to re-enter a product key.