I use the following command for copying drivers:
REMEXEC390=cmd /c xcopy h:\drivers\32-bit\*.* c:\drivers /e
You might want to add /y to the end of that if you already have a c:\drivers directory structure within your image.
The command is located in the WinPE OSD script just before
REMEXEC40=RunBatch -1 X:\LDCLient x:\ldclient\FixVista.bat
Actually figured it out on my own... I had to use the full server path, not using the 'h' parameter...
So, this line is what's working now...
REMEXEC310=CMD /c xcopy
uswnt038\images\drivers\R61\*.* c:\drivers /s /i /y, STATUS
Drivers inject correctly, and the rest of the imaging process sails along as normal... Easiest to tell when it adds to the domain, since without the NIC drivers, it can't connect to the LAN...