[Linux-based] [XPSP3] BSOD after bootvid

I've got my Linux-based RIS running, and booting Windows 7 setup. After attempting to add Windows XP (for backwards compatibility), I find myself rather stuck trying to get to Stage 2 of the setup process.

I get to the point where "Setup is starting Windows" and I see the bootvid, but moments later I get a BSOD with the following information:

PROCESS1_INITIALIZATION_FAILED

STOP: 0x6b (0xC...3B, 0x2, 0x0, 0x0) (Shortened for your viewing pleasure )

The code 3B indicates that STATUS_OBJECT_PATH_SYNTAX_BAD [0xC000003B] :: The object path component was not a directory object.

Running Wireshark, I captured data that indicates that Windows Setup is in fact querying my Samba server and logging in (with no password, something that was explicitly allowed) but stops there. Attached are the details in text format.

Packets.txt

Problem is, that even though the request does seem valid (mostly), Windows Setup chokes for no apparent reason. Any ideas on how to fix this? I'm quite lost on anything else I can do for this...