Mapped drive errors

We have a Gateway PC on our LAN. After some problem with viruses (they have been removed) we can not connect to a shared drive on the server. The GUI shows no mapped drive but when we try to create the mapping, we receive the following error: drive:\ is already connected to \\\, Do you wanted to connect anyway? If you respond YES, the msg reappears with no mapping. There is no UNC path given, just \\\. If we try to use Net Use to disconnect or create drive, we receive similar errors. Anyone with an idea, it would be greatly appreciated. Thanks.

Steve