I started working on a network with 10 computers - including my own XP laptop.
All of the computers are set for DHCP.
There is a single DSL modem feeding a single 16-port switch.
The switch goes to a patch panel which feeds all the ethernet jacks in the small building.
Originally, there were two workgroups: MSHOME and OFFICE and I found one computer with WORKGROUP.
I changed them all to MSHOME because the critical computers were communicating on that workgroup - so I figured to join the others into that one.
Most of the computers are XP. One is 98 and a new one is Vista Business.
The Vista machine doesn't see any other - just itself in the MSHOME workgroup.
What I shall call MSHOME #1, has 6 computers including the Vista computer and a computer I shall call COMMON1.
What I shall call MSHOME #2, has 5 computers including COMMON1
COMMON1 shows all of the computers.
I have been patient, as I have advised others here. I shut down all the computers and selectively brought them back up. This had no affect.
I have to go back tomorrow to resolve this. It has me stumped for now.