I had similar issues for some WinXP drivers not making it to the machine during the scripted install.  I worked around this by creating postinstallation tasks for these.  I've found that typically if you download/extract drivers from the manufacturer, there will be a readme (or similar) text file that will include instructions on silent install switches.  For Dell drivers, these pretty much always use "setup.exe -s", with the exception of the NIC and the video (if not using integrated video), but again these are similarly documented.

I realize that taking this approach is generally frowned upon as the deployment at that point becomes hardware dependent (due to the non-generalized postinstallation task), but it has worked well for me.  In my job, if I can find an alternate solution that does the same thing and I don't need to spend an inordinate amount of time setting it up and maintaining it, it's good enough for me.

John

apparently there was something wrong in the answer file of the unattended installation. We've made a new one and all drivers were installed correctly.

Nevertheless thank you guys for the answers.

What Drivers are not installed on the Windows XP? Do you need to install it after scripted installation?