Help - Hyper-V suddenly can't connect to network

hi there,
need help please. we just installed Hyper-v 2008 R2 on Host with Windows 2008 R2 enterprise.
first time is ok, VM can connect to real network, and other PC in the same network can connect to this VM.
but now, suddenly the VM can't communicate to each other on same network, and others can't detect the VM.
try to diagnose the network, still no effect.
any advice please?
also, when we add network card as a virtual network, the system will create another virtual private network. what is the best practice to configure this one (a real network card, and its virtual private network card)?
thanks in advance

problem occurs from the driver. reinstall the driver and ..done.thanks

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