The Windows 7/Vista LAN Manager Authentication Level must be changed to allow communication with the older NT/XP systems.
Start>Run>secpol.msc>Local Policies>Security Options>
set 'Network Security: LAN Manager Authentication level' to 'Sent LM & NTLM - use NTLMv2 session security if negotiated'
This can also be accomplished via the registry:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa]
"LmCompatibilityLevel"=dword:00000001
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