Cant see my own computer on network since SP update

Archived from groups: microsoft.public.windowsxp.basics (More info?)

My home network:

2 XP Home Desktops, mine has the DSL modem and shares the net connection
1 98SE Desktop
1 XP Pro laptop
2 2000 Pro Laptops

OK, so I installed the SP 1 update (I think it was 1, the latest SP anyway),
in My desktop that shares the internet connection and has all the printers,
etc.

After this update, seemingly, this computer is no longer visible on the
network. Yes, the drives/folders are shared, and I can ping it by name from
any of other computers, and I can also Map a Network drive. It is just not
visible in the list of computers on the network, and its driving me crazy.

Any idea of why this is happening, or more importantly, how I can fix it?

TIA
Diane