I am having the same issue here, and things become a little more bizarre:
My computer (OS X 10.6.6) is connecting to a Dell 1100 (which is a Samsung something or other) shared on a Windows 7 computer using the SpliX v. 2.0.0 driver. Works beautifully.
My roommate's former computer, an eMac running OS X 10.5.8, used to print just fine to the same printer over the network using a slightly different driver. She recently got a new MBP, and used the Migration Assistant to port over all settings and preferences. She is now running 10.6.6, but now gets this "NT
STATUS_ACCESSDENIED" error, even using the same drivers I'm using, even using my username and password when prompted for authentication. Her IP address is different than it used to be, but I already checked the firewall on the Windows, and made sure nothing was being blocked.
Feels like a locked room mystery!
I have to think it's something in Windows specifically, but am at a loss. Any suggestions?
Thanks in advance!
sandra