You might have to activate Windows again in a number of instances, such as:
- You uninstall Windows on one computer and install it on another. (This applies only to Windows Vista acquired via a retail purchase.) During installation, enter the product key that came with your copy of Windows. If automatic activation fails, follow the instructions that walk you through activating Windows by phone. You will have 30 days to activate your copy of Windows.
Note: If you acquired Windows Vista pre-installed on a computer, Windows Vista cannot be moved to another computer.
How many different computers can I install Windows Vista on using the same product key?
The number of computers on which you can install Windows Vista depends on the software license. For example:
- If you acquire Windows Vista via retail purchase (boxed product), it may only be installed on one computer at a time. You may choose to uninstall Windows Vista from the initial computer and install it on another computer. You will then be required to re-activate that copy of Windows on the new computer.
- If you acquire Windows Vista pre-installed on a computer, it may only be used on that computer.
- If you acquire Windows Vista via a volume license, visit the Windows Vista Volume Activation page.
Where do I find my Windows product key for activation?
The location of your product key is determined by the way you acquired Windows Vista.
- If you acquired Windows Vista via retail purchase, you can find your product key on the proof of license label affixed to the installation disc holder inside the Windows package.
- If you acquired Windows Vista via a computer manufacturer, you can find your product key on the Certificate of Authenticity, usually affixed to your computer.