I just worked through what may be the same problem with help from HP for the Elitebook 8560p laptop, which has the Intel 82579LM driver (Dev ID = 1502).
I don't know where I went wrong initially, but using the correct driver download from HP worked perfectly by the book.
We have Altiris 6.9 SP2 in production, WinPE2.1 (which requires Vista drivers)
The download of the Vista Enterprise 32-bit driver from HP for this adapter on this laptop ishere.
I extracted this file (SP52209.exe /e), and then pointed the Boot Disk Creator "Have Disk" dialog to the directory \flat\VISTAx32. The file that is there waiting to populate the driver window is E1C6032.inf. This driver covers Dev ID 1502 and 1503.
With the PXE Configuration Utility set up with this updated WinPE image, I was able to PXE boot and image the 8560p with no problem.
One of the problems I encountered along the way was due to creating a new WinPE image rather than editing the existing (I'm new to all this, and didn't want to break what was already working...). This resulted in our imaging jobs not loading with the correct WinPE image - I had to go into those image job tasks and set the Automation pre-boot environment to the name of the new WinPE image.
Hope that helps!