Continue to expand registry keys and subkeys until you reach the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class key.
Click on the Class key once. Registry Editor should look similar to the screenshot above.
Important: If you're going to play it safe and backup the registry keys you're working with in this tutorial (which I do recommend), the Class key is the one to backup. See How To Backup Registry Keys for help.