Invalid domain on Gui - network driver missing ?

hi
I have a windows 2003 windows deployment server though its using ris
legacy. I'm trying to RIS a Dell D820 and have copied the network
drivers to the image itself loose in the folder, in $oem$/$1/Drivers
with the laptops type below that and $textmode, loose in 386 folder
and in the $oem$ structure and to the windows base image in the same
ways. the riprepfile shows -
Oempnpdriverspath = Drivers\DellD820

It gets past the need for network drivers on the blue text screens but
fails on the windows gui to join the domain ("invalid domain
specified"). the sif file refers to it as -
OemPnpdriverspath = Drivers\DellD820;

[Identification]
JoinDomain = specified
DoOldStyleDomainJoin = Yes

its showing up correctly in the windows gui just not joining it. from
textmode it does create the object in active directory successfully so
I'm thinking I haven't got the driver right in gui mode but can't find
where it needs to be.
Elaine