Will not load drivers in OemPnPDriversPath?

[Mordac85]

I'm building an image for the new Dell Optiplex GX-745 and forgot to update the drivers in a customized PC build that stores a path for an initial Intel chipset driver (from my Optiplex GX-620 build) in the registry at HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\DevicePath. I also have a drivers folder off the SystemRoot that have the updated chipset drivers for the 745. Everything's fine until it's sysprepped. The system doesn't seem to use/see the updated drivers in the OemPnPDriversPath and the HW wiz pops up on the first login for the SM bus controller. If I point it to the folder in C:\drivers it'll install just fine.

I've updated the drivers in the folder called out in the registry and all works fine. So, is there some reason why it seems to ignore the OemPnPDriversPath? I'm going to grep thu the INF's in the older driver folder for the PCI VENID, but if it's not there I have no idea why it's doing this and not knowing really bugs me. Any ideas?

TIA