PC still hanging so decided it may be the video cards. Turned off the hardware acceleration on main gforce, I'll see if that fixes it and try increasing it if it is ok or disabling the v330's acceleration if it is not.
Found 'Network Bridging' in XP. This seems to treat all bridged network cards as a single IP address and it Just Worked. Set Laptop to auto IP and it was away.
Mozilla won't run on Windows 95 on laptop so I'm upping it to 98, only 6 years behind the times.