The drive could not be mapped because no network was found

Symptom: 
When trying to map a network drive, you may receive this error: “The drive could not be mapped because no network was found”

Causes and solutions:

1. The workstation service is missing from the computer's list of services. Install the Workstation service by enabling the Client for MS network.

2. The Workstation service is stopped. Restart it and make sure the Status setup as automatic.

in ChicagoTech.net