contact dell support first, but this helped me with same problem

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The Regfix driver should be installed from Windows text-mode setup using the F6 install option.

 To install the Regfix driver from the Windows text-mode setup interface, perform these steps:

• Obtain the Dell Registry Update Tool here:  ftp://ftp.dell.com/utility/F6_regfix_1026.exe
• Copy the files from the driver package to a floppy diskette.
• Copy the drivers for your boot controller to a separate floppy diskette.
• Boot to the Windows Server 2003 install CD.
• Immediately press the key to install the Regfix driver and additional device drivers for the boot controller.
• When prompted, press the key to select and add additional devices.
• Insert the floppy diskette containing the Regfix files into the diskette drive and press .
• Press the key to select the Dell System Repair Utility.
• Press the key to add the driver for your boot controller.
• Insert the floppy diskette containing the boot controller drivers into the diskette drive and press the key.
• Select the appropriate device driver and press the key.
• Press the key to continue.
  

 NOTE:  After the Setup is starting Windows message, the results of the Regfix driver will appear in a new screen.
 
RegFix creates two new registry values at HKLM\Software\Dell\Dell_RegFix_Success and HKLM\Software\Dell\RegFix\Dell_RegFix_Success.

Driver:

http://support.euro.dell.com/support/downloads/download.aspx?fileid=129538