I slipstreamed some packs into a Win7 x64 installation, and all of them work fine, except for nVidia drivers. When I deploy the image to the compuetr, after all the configuration steps, it shows the desktop and displays an error about the video driver install, saying "The drivers for this device are not installed" (Code 28). After that, it goes to install the default Windows driver.
This only happens with nVidia drivers. ATI/AMD works fine.