You might try these.
Intel® 82566 Family Gigabit Ethernet Controllers
Cleatus, I assume you are trying to multi-cast. If so, I found a working solution (Ghost 7.5) after downloading drivers from here:
The only requirement is that you have a working 780 multi-cast boot disk that uses e1000.dos driver for contacting the multi-cast session. I use winimage to create img files of my boot disks so all I had to do was inject the new e1000.dos driver into the 780 img file and create a new 790 boot disk from it. Worked like a champ for me. I hope this helps.