Download and install the latest drivers from Intel's website. Dell has yet to post them. Since you've already loaded the OS follow these instructions taken from Intel. You don't have to use a floppy, since you XPS400 has a 50:50 chance of not having one, so long as you know where you put them during the extraction.

 

Some Intel(R) chipset platforms already are supported by
Windows* XP so it may not be necessary to use the INF
files provided by this software to update Windows* XP.

The following steps describe the installation process of
the Windows* XP INF files. You may need to repeat these
steps to update all Intel(R) chipset devices not supported
by Windows* XP.

    1.  Copy the contents of the
        \XXXX\WinXP
        directory to the root directory of the floppy disk (A:\).
       
        NOTE:
            XXXX is the directory name for the chipset
            of interest. Refer to Section 8 for more details.
             
    2.  Close all programs currently running on the system.
    3.  Click on Start.
    4.  Select Settings.
    5.  Select the Control Panel.
    6.  Double-click on the System icon.
    7.  Click on the Hardware tab.
    8.  Click on the Device Manager button.
    9.  Select "Devices by connection" under the View menu.
    10. Click on MPS Uniprocessor PC -OR- MPS
            Multiprocessor PC.
           
        NOTE:
            Only one of the above items will be
            displayed for a given system.
           
    11. Click on PCI bus.
    12. Right-click on the line containing the description
            PCI standard host CPU bridge
            -or-
            PCI standard ISA bridge
            -or-
            PCI standard PCI-to-PCI bridge
            -or-
            PCI System Management Bus
            -or-
            Standard Dual PCI IDE Controller
            -or-
            Standard Universal PCI to USB Host Controller
            (This line will be selected.)
    13. Select Properties from the pull-down menu.
    14. Click on the Driver tab.
    15. Click on the Update Driver button.
    16. Windows* XP will launch the Upgrade Device Driver
            Wizard. Select Next.
    17. Ensure that the following choice is selected:
            Search for a suitable driver for my device
            (recommended)
    18. Insert the floppy containing the Windows* XP INF
            files into the floppy drive.
    19. Select Next.
    20. Windows* XP will list locations from where the
            updated driver file can be found.  Ensure that the
            following choice is selected: Floppy disk drives
    21. Select Next.
    22. Windows* XP should report that a driver has been
            found: (The detected device name will be displayed.)
            Select Next.           
    23. Select Finish.
    24. Reboot the system when prompted to do so.

Hi there.

 

I have the same problem with my XPS 400.

The advice Geotex1 gave is perfect except that I can't find the driver on Intel's website.

And I've looked. And looked. And looked.

 

Does anyone know where I can find this driver to download?

 

Many thanks.

 

W