Hi Andre,
Thank you for the suggestion. I think I had already put VMWare tools on, but I downloaded the iso from the link you gave me. It all seemed to work on XP, restarted the system, and then I restarted VMWare for good measure.
It wasn't working, so I checked that the network adaptor is on NAT (it is), reinstalled the Tools just in case, shut down XP, rebooted VMWare, and tried again.
Still no joy.