Vista defaults to only send the more secure NTLMv2 protocol, which Samba (and some NAS devices like the WL-700gE Router) do not support. This device is running Linux internally - great router btw ;)
To fix this click
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Click Start/Run
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Run
secpol.msc
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Go to
Local Policies | Security Options | Network Security: LAN Manager authentication level
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Change the settings from
Send NTLMv2 response only
toSend LM & NTLM - use NTLMv2 session security if negotiated
Good Luck ;)