Your problem should relate to drivers. You can't install 32-bit drivers on 64-bit windows. Unfortunately, you would have to find the 64-bit drivers for your broadband modem. I wonder how you couldn't install the 32-bit dialer application. 32-bit applications should install seamlessly on 64-bit windows. The way I see it is maybe the dialer installer is bundled with the 32-bit drivers. And during the installation of the dialer, you are being presented with the stage which installs the 32-bit driver and it fails there. Is this something you experienced? You ought to be more specific on the problem.