If you were directed to this method, you have the correct product key, but you have to try entering it again to reactivate Windows Vista. To do this, follow these steps:

1. You have to click on the Start button which is situated on the left side of the taskbar, and click on the computer, and after that click on the System properties on the toolbar.

2. And in the Windows activation section, click on the Change product key option. If you are encouraged for an administrator password or for verification, type your password, or click on the Continue.

3. And in the Product key box, sort the product key, and after that click on the Next.

Kindly Note Make use of your unique product key.

4. Follow the steps in the Windows Activation Wizard to complete the activation process.