@Hoppy, For dutch language in nVidia Config Panel you only have to copy nvrs
nl.dll to the system32 directory. You can copy this file uncompressed in your unattended installation to the following directory:
$OEM$\$$\System32.
For other languages you can use the same file, with the bold text replaced by the language code.
@Sixpack, you have to look for a subdir with an inf and some driver files ( .sys, .dll ), when you get an error that some files are missing, note them down and try to find out if the files are included with the ATI Setup file. Then copy only those files to the directory containing the installation inf and redo the process.
@Ionit, tested your Speedtouch USB drivers with i6comp.exe, you have to type this:
i6comp.exe e -f data2.cab *.* "C:\SpeedtouchDrivers"
You get a lot of directories, but only some are relevant: PPPoA, PPPoE and WDM. Make sure you only use the "SpeedTouch 330 ADSL Modem Update" drivers, these are newer.