Network card Stops working after Install

[Stoneguard]

Hi, I am new to the forums, but hoping someone may be able to help. Here is the secnario. I am performing an unattended install on an HP system with the OEM drivers on the disk. The drivers install fine, the system is joined to the domain and the install completes. The system, reboots, and the device manager reports a problem with the network card drivers.

If I uninstall the device and scan for hardware changes, it uses the exact same drivers (already on the disk), prompts for verification of using an unsigned driver, and then they work fine. In my sif file I have "DriverSigningPolicy = Ignore". Two of us have looked at this and are at a loss.

Any help or ideas would be great!

[Stoneguard]

Ok, I think I figured it out myself. I added the line "OverwriteOemFilesOnUpgrade=No".