Hi,
Yes, I think you are correct, the most likely situation is not accepting NTLM but only supporting NTLM2.
I do not think there are DOS drivers that support NTLM2, the best option is to use Ghost32 with WinPE. In case if you haven't used Ghost32 so far - It has the same interface as DOS Ghost, and images are fully compatible.
However, your photocopier would be still a problem unless you change the security settings...
Krish