Posted on 27th Jan 2010 @ 2:28 AM
1. Open Windows Anytime Upgrade from the Start menu to see two options: purchase a WAU product key online or enter a WAU product key from a WAU retail package purchased in a store. Select the first option if you have a WAU product key.

2. Enter the WAU product key.
3. Accept the license agreement.
4. You will be asked to save your work and close all running applications. The Windows 7 upgrade process will take 10 to 15 minutes.

5. That is it. Your PC will reboot once to finish the final step of Windows Anytime Upgrade process.