I thought at first glance my powermate installation failed as well under In7/64 - uninstalled and installed a few times but no VISIBLE result.
Actually the installation was ok, there is no feedback - so more accidently I found the hidden powermate icon right lower edge of the screen and set it to display permanetly.
I am not really familiar with the settings, but installation of the Griffin driver (vista compatibility) was all ok.
Just nedd some help to setup.
73 Charly, DF5VAE