I am only just back in my office today.
Your advice given is below with my comments
Can you see the other computer on the network?
Can you ping it's IP address?
I ping it's ip address but no response (192.168.2.102)
I have typed arp -a and it's ip address does not show. Just the printer 192.168.2.101 & 192.168.2.1 router and 192.168.2.255 (not sure what this is)
Can you map the shared folder on the other computer?
not able to map folder
Also ensure there's no third party firewall on either computer
You could try temporarily disabling all firewalls to see if it helps.
have switched off third party virus software and windows firewall.
You will need to have mapped the folder on the other computer too.
Instead of mapping it by IP, try mapping the username instead, i.e. \\USER1-PC\mark scan folder
Tried this but it cannot be found
Make sure network discovery and file and printer sharing are turned on. Public folder sharing should also be turned on.
all turned on on both computers but no difference