AD (Windows Server 2008 R2 DC's) x86 Print driver issues

Hi there,

I've been trying for several days to install an x86 additional print driver in a 64bit WS2008 R2 (which is the AD primary DC, also with the Print Server role installed).
I always get the same error... which tells me that the driver must be installed from an x86 workstation, using the local print server to connect to the print server on the WS2008 R2 and then upload the x86 driver to it.
But when I try to do this, it always fails, reporting an error that says something like "It's not possible to install the XXXXXX x86, type 3 - user mode driver. The operation could not be completed (error 0x00000490)".
The workstation where I'm trying to upload the driver from, to the WS2008 R2 server, is an AD member.
It also fails when I try to locally install the driver directly into the x86 workstation or WS2008 R2, using the domain administrator credentials.

I then removed the workstation from the AD... and then was able to successfully install the x86 print driver on the x86 workstation!
Obviously, the x86 print driver continues to fail on the WS2008 R2.

I then put back the workstation into the AD... and the problem came back!

Is there anyone with the same problem?... I would appreciate any help!

Thanks.