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You can find your product key on your computer or on the installation disk holder inside the Windows package. Although you are not required to enter your product key now to install, failure to enter it may result in the loss of data, information, and programs. You may be required to purchase another edition of Windows Vista. We strongly advise that you enter your product identification key now.
The product key sticker looks like this:
Product key (Dashes will be added automatically):
Do you want to enter your product key now?
If you choose not to enter the product key now, you might need to reinstall Windows later and potentially lose data, information, and programs, or you might need to purchase another edition of Windows.