Just registered to say thanks to those responding to this thread and to provide the fix that worked for me.
I'm using BartPE 3110a along with the DP_LAN_wnt5_x86-32_1011.7z driver pack to boot on an HP Ellitebook 8740w. I was having the same problem w/the Intel 82577LM.
So here's what I did after reading this thread:
~ I found the drivers for the 82577LM on the OEM Windows XP 32 bit OS. Just launch the Device Manager and look at the driver details for the NIC. Copy the files listed to the location; C:\pebuilder3110a\drivers\Net\foldername
~ Then use 7zip to extract the DP_LAN_wnt5_x86-32_1011.7z to a seperate folder.
~ Open the zip file; C:\D\L\I\RIS\e1k5132.zip and copy the e1k5132.inf to the location; C:\pebuilder3110a\drivers\Net\foldername. (Same folder you put the System32 driver files)
~ Then just build your disk.
This worked like a charm for me. Hope it works for you too!
Thanks again all.
~Blarney
Edit to add... looks like the previous poster found the same fix... 