Help from softies required Update
I changed 1 digit to render addresses anonymous.
It can see a gateway but nothing beyond it on the subnet
The IT guys did an update, a full repair fro the latest XP (with SP 2 included) installation and no luck (wher you boot the system to install and it finds an exiting installation and ask do you want to repair instead)
They then booted from a Mandrake linux CD and the PC worked fine - got its IP address and connected via the proxy to the internet.
So, its an XP software problem They suggest reinstall of the complete system.
Any more guesses before I go down that road?
C