Saving to a Network Drive in Excel.

Im on an NT network and am trying to save a document to a shared network drive. It seems to take forever and I get this message…..

The System was attempting to transfer file data to buffers to \I:\sris1dc\materials\central services\MONTH END\ea972100. The write operation failed, and only some of the data may have been written to the file.\

then the file has not been saved at all.