You might try the Fujitsu US Technical Support page
. I did a manual search for P320 and the results should be listed, unless the page expires. We can't really help you further without more specific information about the computer you are trying to find drivers for.
Here is a link to the main Fujitsu US Support site
It is unlikely that your video card is incompatible with Direct3D. Since you just installed Windows 7, it is most likely you need a driver for your graphics device in the computer. Upon the installation of Windows, it is normal to find that only a generic graphics driver is used, if the hardware is not recognized during the installation process. In the case of audio device not functioning, either a generic driver will be used when possible, or no driver at all will be used, at which point you must provide your own, even for minimal functionality.
It is recommended when installing your operating system, to first collect any necessary drivers, and in the case of upgrading to a newer OS, make sure that there are even drivers available, or you may be left with only a partially functioning computer. Networking drivers are often overlooked as well, and can prevent people from finishing their reinstallation if they have no convenient access to another computer.