Expand the Class registry key by clicking the |> to the left of the folder icon. As before, in Windows XP it will be a (+) symbol.
You should now see a long list of subkeys appear under Class.
Each of these 32-digit keys are unique and correspond to a specific type of hardware in Device Manager. In the next step, you'll figure out which one of these hardware classes to look for the UpperFilters and LowerFilters registry values in.