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I have been using ubuntu and virtual box mounted xp on it, I suddenly experienced this error when I tried to open the folders shared on Z:

i have reinstalled guest additions but could not find a solution

The error message is:

an error occurred while reconnecting z: to \\vboxsvr\user
the network could not be found
the connection has not been restored
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@EvandroSilva thank you!!!! – Corleone Nov 4 '12 at 4:30

Everytime you shutdown the virtual machine, you have to set up your shared folders again, unless you checked mount automatically and make permanent.

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