If you decide later to upgrade your version of Vista (i.e. from Home Basic to Home Premium), you will need to change your product key. Or, if you're having a problem with the product key you enter and you have to change it. All you need to do is follow the instructions below:
- Open the Control Panel folder under the Start menu.
- Double-click the System applet.
- Click the 'Change Product Key' link in the 'Windows activation' section.
- Then follow the instructions in the Windows Activation dialog that is displayed.