This is the latest driver version for the Intel NIC's: [URL] (Sorry, you'll have to copy/paste the link until Dell fixes their forum issues.) First try the "Update Packaqe for Microsoft Windows".  If that doesn't work, then download the "hard drive" version, run it to extract the files, then run the setup file to install.  You could also try installing the INF's from Device Manager. What SP level are you at on 2003?Did you install the chipset drivers first?What is your system BIOS version? 
Hi, I'm reinstalling W2K3 onto a reclaimed PowerEdge 2800 server with the onboard RAID enabled. Everything installes fine except for the dual NICs. I've download all seven files available in the Drivers section of Support using the machines service tag but NONE of them will install. The broadcom drivers (NetXtreme and NetXtreme II) all stop saying "This update package is not compatible with your system configuration". The Intel Pro Gigabit drivers come up with "The Update package is not compatible with any of the devices detected in your system". I know both built in NICs work as I installed Centos 6.5 Desktop on it first to check the hardware and they both worked fine under it. Does anyone know which are the correct drivers for W2K3 and where on Dell's website I can find them? Much appreciated.
PowerEdge 2800 NIC Drivers for W2K3 Server