This could be a network connectivity issue, or possibly one of name resolution. When troubleshooting, it's best to start at one end of the connection and work your way systematically to the other. Can you ping 127.0.0.1? Can you ping 'localhost'? If these are failing, then there's an issue with your TCP/IP configuration. Can you ping the servers that house your network drives by IP address? By DNS name? If you can't even reach an IP address, it means that you're having connectivity issues. Use tracert or pathping to determine where the connection is being lost. If you can ping an IP address but not the machine name, check your DNS or WINS settings, especially if you have any static entries in your WINS database.
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