Thanks. I had sussed that one and I have since networked the 98 PC. I had also to tick the box which said something about logging on to the NT network, even though NT is not involved. I set up a password protected log-in using the workgroup name as the domain, as all 4 PCs in the house are in this workgroup.
I may have got this totally wrong but it works.
If I need to fine tune anything I would welcome any feedback.