网上查了一下资料，总共有以下几种做法：
1。防火墙
2。
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Open the Run command and type "secpol.msc".
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Press "continue" when prompted by Vista.
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Click on "Local Policies" --> "Security Options"
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Navigate to the policy "Network Security: LAN Manager authentication level" and open it.
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By default Windows Vista sets the policy to "NTVLM2 responses only". Change this to "LM and NTLM – use NTLMV2 session security if negotiated"
3。microsoft 网络客户端没有正确安装
在实际操作中发现3和实际发生的故障现象比较吻合。验证一下。