Thanks, I gave that a try. It has made the network visible on my other PC (Casemore) where both computers are now visible.
On my PC, my PC does not appear in the network but the other PC does. On my PC, Network only shows the other PC but I still can't access the other PC as I get the error message:
\\DESKTOP-DFMAJV1 is not accessible. You might not have permission to use this network resource. It does not show my PC but does show the Media Centre on my PC!
The other PC shows both PCs on he Network but will not allow me to access the Roger PC.