Ah ha Fixed
Start>Control Panel>Programs and Features
Click "Turn Windows features on or off" (Left hand side).
Scroll down to SMB 1.0/CIFS File Sharing Support
Tick the SMB 1.0/CIFS Client
Untick SMB 1.0/CIFS Automatic Removal and
Untick SMB 1.0/CIFS Server
Note SMB 1.0 is apparently a very insecure protocol and should not be used.
Off to ask the network guy to upgrade the server
Moderator's note:
Please note that SMBv1 protocol is not installed by default in Windows 10 V1709 or later. Microsoft publicly deprecated the SMBv1 protocol back in 2014.
For details, refer this support article: https://support.microsoft.com/en-us/help/4034314/smbv1-is-not-installed-by-default-in-windows