All of the Microsoft Windows Vista operating system products are on the same disc. It is the product key information that activates the Vista product that you have purchased.

If you would like to upgrade to a different Vista operating system, Vista makes changing the product key easy.

• Go to Start > Control Panel > System
• At the bottom of the System applet, click on the link: Change product key
• Click Next
• Enter your new Vista product key ID information
• Click OK
  

That's it!