Perplexing problem with wireless connectivity

-- I am experiencing a perplexing problem and believe it originates with the
ACER Laptop PC that was purchased recently. My ACER laptop is model Extensa
5420, with Microsoft Windows Vista XP Home Premium software with SP1
installed. I use this laptop in a small home network as a wireless PC and
have been trying to get it to connect with the network to no avail. The
network is configured as follows:

Desktop PC #1 with Microsoft Vista Home Premium edition and SP1 installed
and Ethernet hardwired into the network.

Desktop PC #2 with Microsoft Vista Home Premium edition and SP1 installed
and Ethernet hardwired into the network.

Desktop PC Server with Microsoft XP Home edition and SP3 installed and
Ethernet hardwired into the network.

Toshiba Satellite Laptop #1 with Microsoft XP Home edition and SP3 installed
and installed wirelessly into the network.

ACER Extensa 5420 with Microsoft Vista Home Premium edition and SP1
installed and installed wirelessly into the network.

The problem is that all PCs except the ACER see and communicate with the
network. The ACER refuses to see the Desktop PC Server which is where all of
our data is stored. The Desktop PC Server sees the ACER but cannot
communicate with it but the ACER will not come up on the network at all.

I have gone thru the normal steps of verifying the network name, machine ID,
rebooting etc., but nothing works. I would appreciate any help you could give
me as this has become quite a problem and I am not sure where to turn.

tone4