Vista newbie needs LAN setup help

I provide the technical support for an international photographic competition
and this involves setting up a temporary wired Ethernet network to
interconnect several laptops during our entry processing or judging sessions.
This network uses a small 5-port Fast Ethernet switch and fixed IP addresses.

Previously, I only used laptops running Windows XP and everything was fine.
I'm now trying to add a new laptop running Vista Home Premium and am hitting
problems due to my total lack of any previous Vista experience. I have
managed to set the IP address on the Vista laptop but it cannot 'see' any
other machines on the network and the XP laptops cannot gain access to the
Vista machine.

Some basic facts:
There are 4 laptops in this network. Their names are Dell-M20, Louis,
Scc-No-1 and Scc-No-2 (Louis is the Vista laptop).

If I open Windows Explorer in each machine and try to view the network I get
the following results.
Dell-M20 sees Louis, Scc-No-1 and Scc-No-2
Louis sees Louis only
Scc-No-1 sees Dell-M20, Louis, Scc-No-1 and Scc-No-2
Scc-No-2 sees Dell-M20, Louis, Scc-No-1 and Scc-No-2

The Vista machine (Louis) can successfully ping all the other machines but
pings from the XP machines to the Vista laptop all time out.

All the fixed IP addresses have been checked. They only differ in the final
number of the set of 4.

I would appreciate some guidance on how to get my Vista laptop talking to
the others.

David
.

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