Having to manually install drivers

[Travelcard]

In my XP SP3 build CD I copy my drivers to an install folder on the root of the C: drive.

I then add the paths to the drivers to the OemPnPDriversPath entry in my winnt.sif.

After the build completes there are about 5 unknown devices, but if I delete those devices manually and re-scan for hardware changes all the drivers are added automatically.

So, Windows has the drivers and knows where they are. Any idea why this could be happening?

Thanks for any help