To rule out the host file as a point of failure, see if you can ping the servers you're trying to access, both by IP address and by host name. Try using a WINS server or an LMHOSTS file if name resolution is a problem. Also, make sure that the machines that are hosting the resources in question have assigned the "Access this Computer from the Network" right to the appropriate group(s) and that the Network special group has not been removed or denied permission to the resources that they are attempting to access.
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