I installed the 64 bit version of Windows 7 on my Amilo XI 3650. I now have some problems that could be fixed with a driver update, but I can't find the driver

The problem is that the cool bar with the pause and stop and next en volume-stuff doesn't work the way it should. The basic options like pausing a video works, but switching between the graphicscards does not and the volume-buttons work very poorly as well.
Can anyone give me a link to a driver that will cure my problems? If there isn't an official driver, I don't mind using a third party driver, but I do want to read reviews and it has to come from a good site or forum. If there aren't any drivers for my problem, does anyone know when Fujitsu Siemens will release one?
Thanks in advance!
Simon