Hello GHI guys,
I’d like to share some infos with you and with other users.
I have a Fez Domino. I have installed a new PC with Windows 7 Ultimate 64 bit. I’ve installed without problems the NETMF interface driver from my:
C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\USB Drivers\GHI_NETMF_Interface
But I was not able to install the BootLoader driver from:
C:\Program Files (x86)\GHI Electronics\GHI NETMF v4.1 SDK\USB Drivers\GHI_Bootloader_Interface
My Windows asked me for the drivers but they did not install/work. After some search, another user had a similar problem. His and my Windows do not contain the usbser.sys file under Windows\System32\Drivers. So I have taken the file from another pc running win 7 pro 64 bit and placed in the win 7 ultimate and now the driver installs and works correclty.
I don’t know why my Win 7 Ult 64 bit was without usbser.sys. It was a fresh install of the OS. I have done it a week ago.
Now I have successfully updated the firmware of the Domino and deployed my app on the device. 
Fabrizio