This will work for this as well as other pci devices in the future that you can not identify. Use Craig's PCI diagnostic software @ :
You will need the PCI32.ZIP Version 1.0 10/02/2005 - Windows NT,2K,XP,2K3,.NET etc. version.
You have to run this at a dos prompt and pipe it to a text file for ease of use:
Lets say you download the file and extract it to "C:\" using any compression program. i.e, Winzip...
Then open a command prompt go to your windows start button and then: "Run -> CMD"
This will give you a dos box. Now type the following verbatum to run the program:
cd \ <enter key>
pci32.exe > C:\hardware.txt <enter key>
This will create a text file in the root of C:\ with a list of pci devices. Now look through it for one that is labled Network which will be the guy you are looking for.