The product key that you enter when installing Windows 7 determines what version of the operating system is installed. This means a single Windows 7 DVD can be used to install the multiple editions. One question that immediately arises then is “how can I upgrade my existing version of Vista to a version that has additional features?”
The answer is to change the product key through the System applet.
- Right click My Computer and select Properties.
- Click on Change Product Key Link.
- Enter a new product key.
- Click Next to activate the new product key.