I am currently working with Falcon Techs on a few issues with my Falcon. It is running Win7 x64 and has lost the driver(s) for the Microsoft Natural Keyboard 4000 (USB). We keep ending up with a can't find drivers error.
We have cleaned out the registry, device manager, and uninstalled Intellipoint. When you look for drivers at Microsoft the only offering is Intellipoint. However, I suspect the actual driver is located in Win7 and not Intellipoint.