make sure that you use the vista version for the NIC driver.
I have the same problem but i have find the good one.. after few weeks ;-)
I'm going to assume you have already updated your PXE reps. You don't have to have vista drivers. If you are booting into WinPE, an XP driver will work just fine as it just needs SOME type of driver to use to connect. Make sure you are including the .cat file in your injection as you will need this file also.
Try injecting ALL of the files I've attached and let me know if this works for you. (the limit is 5 files per post so there will be two posts containing the files).