Multiple Wireless Problems

Hi,

Background...
I have a combination wired and wireless network at home.
ADSL Router: Dynalink RTA220 Series wired via an 8-port hub to two PCs
[Vista Ultimate and XP Home] (all working okay)
Wireless Access Point: rather old Cameo WLG2003c on 802.11g (connected
to a an HP laptop [XP Pro] (okay) and two PCs [XP Pro and Vista
Ultimate] (very poor connection as about 20 metres (60feet) and a few
rooms away)

Changes...
I have recently added a Wireless HomePlug Combo (NetComm NP295Starter -
NP290W Wireless Homeplug and NP285 Turbo Homeplug) which has a pair of
Ethernet 'plugs' for using the power circuit in the house to create a
'wired' connection to a wireless transmitter where the two PCs are
located. In other words, one plug is Ethernet wired directly to the
router (via the hub) into the power circuit and connects to the other
plug (via the power supply circuit) which has a wireless transmitter
which connects to the wireless USB transmitters attached to each PC.

When the network 'plugs' were connected, one PC [Vista] immediately
discovered the wireless connection (when I selected it to refresh the
wireless connections) and connected without any problem. No software
was installed (as apparently it is not necessary anyway) - this
connection was the default unsecured connection. I checked the Internet
connection by going to Google - okay. I then went to the Web User
Interface for the new devices to set up the network under a new name
and to enable WPA for secured network. This is where everything went
wrong.

Problems...
I lost the connection to the Internet and I am unable to acccess the
Web Interface.
I have tried resetting the device several times, but although I get
connected to the wireless plug with a strong signal I cannot access the
Internet or the Web Interface. (i.e. seems to be a router issue?!)
I have attempted reboots of the PCs, tried setting the connection up
with the other PC [XP Pro] and my laptop, moving the plugs to different
sockets, removing firewalls, resetting my router, but all with no
success.
I can't understand how it managed to work at the very beginning but
even after several resets it has failed to get connected again.

After several hours of hair-pulling, I have since striped my entire
network apart, reset everything and reconnected all the devices again.
Still no joy.

And, now, my wireless Access Point won't allow WEP or WPA security
either! The web Interface device for this says "the connection was
reset" every time I attempt to enable encryption. Why? I don't
understand.

So now I have an unsecure wireless connection taht can't be secured and
no connection with the Home Plugs (even though the did in the beginning)


I have installed the software that comes with the device as well,
during this earlier process and since, and it recognises the wireless
plug, allows me to rename it but cannot seem to connect with the router
(and therefore the Internet) to complete the installation process of the
software package.

HELP!


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