When building an image that is to be used on multiple machines of the same type, it's useful to keep the drivers after running SYSPREP.

To do this run the following prior to SYSPREP

Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup\Sysprep\Settings\sppnp

Select Edit - New DWORD value

Name the new value PersistAllDeviceInstalls

Set to a value of 1 and click OK