To upgrade from Windows 7 Home Premium to Windows 7 Professional or Windows 7 Ultimate, you can use Windows Anytime Upgrade instead of reinstalling everything. To do this, do the following:

1. Click on Start, and then right-click on Computer and select "Properties"

2. Click on: "Get more features with a new edition of Windows 7".

3. Click on "Enter an upgrade key"

4. At the upgrade key screen, enter your Windows Anytime Upgrade Key and click Next


The entire upgrade process typically only takes 10 to 15 minutes, and should not require Windows 7 install or upgrade media. After the upgrade process is complete, your computer will restart and you should see the new version of Windows 7.

5. Open Computer Properties to confirm your upgrade. At the bottom of the window, you should see a link to activate your new version of Windows 7. Make sure you are connected to the Internet and click on "Activate Windows now".


Once Windows 7 is activated, you will see this message at the bottom of the Computer Properties window: