I'm having the same problem.
This DOES NOT happen with either Windows 7, or Windows 8.1; in each of these cases, the drivers seem to install successfully. Like with Andy's PC.
If I try to execute some app that uses more of the video performance, the Windows show a popup with a fail in the Nvidia Driver, but this driver is installed correctly.
The systems specs are:
Intel i7-2720QM (HD3000 graphics)
Nvidia Geforce GT-540M ( Optimus Tecnology)
Best Regards.