The Windows interface on the network has one of these problems:
The correct driver has not loaded. Under the Windows Setup program on the client, check the Network option and verify that the correct network driver has loaded. For example, for a Microsoft client, the words Microsoft Network should appear. If they do not, click Change System Settings on the Options menu, then select the correct driver from the list under Network.
The drive connected using the Windows file manager and the existing file manager saved the settings. The user chose, under Windows Control Panel->Networks, to restore all connections at startup, and consequently used the drive letter for DOS to make a different redirection.