Where can i get empowering technology for aspire 5720 with vista ultimate sp1?

I have installed vista ultimate sp1,but the machine came with vista home premium with empowering technology installed, i just want to install the empowering technology specially eAudio manager. i have tried to install it from the acer support site but when trying to install it gives an error stating that it cannot be installed because the machine is not registerd. Please help.