Some additional details:
Using Windows7 RC1, build 7100 and Windows 2000 SP4 [as up to date as 2000 can be]. No difficulty sharing or authenticating on the LAN with any other OS, however my XP box does not prompt me for a password to authenticate myself before accessing the network share on the Windows 2000 machine.
All computers have unique computer names.
XP and 2000 can authenticate to the Windows 7 machine.
The Windows 7 machine connects to the XP machine [does not prompt for password], although it does prompt for Windows 2000 trying to connect to Windows XP machine [authenticates fine]. Perhaps I saved the XP password on the Windows 7 box without remembering, or the XP machine let it in without credentials for some other reason.
When typing in \\192.168.1.xxx\printername in Add Printer (under "Select a shared printer by name"), I get 0x0000052e error, which, if my Google skills are still up to snuff, is complaining about a bad username and password; meaning I need to auth myself to use the printer, which I can't seem to be able to do from any Network dialog, using credentials for a local administrative account on that computer.
Any assistance would be great =), thank you.