Internet computer with ADSL connection, running WinXP Home.
Laptop running WinXP Home.
Switch.
2 x cat5 cables.

Switch plugged in, both computers connected to switch. Internet computer set up using wizard to be the network's internet connection. Laptop set up using wizard to access internet via gateway. Both computers are in the workgroup MSHOME.

Laptop can see itself and its shared folders in My Network Places. However, internet computer cannot see itself in My Network Places, though it can connect to the internet readily enough - it can see the workgroup MSHOME, but there's nothing in it. Also, it takes a REALLY long time to load up My Computer, as if pinging for devices it's expecting but can't find. I've tried disabling the Sygate firewall, but it still can't see itself.

On the ICS LAN connection, MS network client (or whatever it's called), File and Printer sharing and TCP/IP are installed, plus some others whose names I don't recognise.