Trouble introducing Toshiba to existing Airport Express (Mac) network

Hi all,
I've been away from Wintel PCs for around six years. Last time I spoke to the outside world with one was Win95 with ISDN & Hyperterminal connection!
Have had a mixed wired & wireless always on connection for around a year. Two existing Macs connect via Ethernet, whilst my iBook connects via Airport Card to Airport Express Base Station with iTunes.
Recently acquired a Tosh TE200, which connects to my router via ethernet, so has been updated to latest SP2. Furthermore, I've been able to download my data via smb over my LAN. So far, so good.
I don't know where to begin, though, to get my PC to talk to my Macs, which would be nice.
The bigger issue, however, is the fact that the Tosh can see the Airport signal, but can't seem to connect to it. In the Taskbar at the right, the warning given is, Not connected: right click for more options. When I view available connections, there's a big, fat five green bar signal from my Airport Express Base Station. It describes itself as:
Security-enabled wireless network
This network requires a network key. If you want to connect, click Connect.
When I click Connect, it goes through the motions (Please wait while Windows connects to the 'AirPort' network. Waiting for the network...) but doesn't connect.
I've scouted through iFelix's description and a few posts, and all settings appear to be alright.
Is this something I'm going to need to get a native XP version of AE Admin Assistant/Setup Utility & plug the Tosh into the AE Base Station with Ethernet?
I'm concerned about the danger of flashing my Base Station settings with the Tosh, cos the iBook gets considerable network, online & music use.
Can any of you guys plod me through this predicament? Please be gentle - HAL was thrust upon me for native business use.
G4 Cube 1GB RAM/G3 iBook 640MB RAM; AirPort Express/G3 iMac Rev B 640MB RAM/iPod   Mac OS X (10.4.5)   iMac OSX 10.2.8 Toshiba TE2000 XP SP2

iFelix, thanks for your response. I took a look at your link already, but some of it's a bit over my head. Didn't have this much to do to set up Macs. iBook also automatically recognises and connects to other wireless routers.
-What security are you running on your Airport network?
-Are you using WEP or WPA?
WPA Personal
-Are you using MAC address access control?
Er....
Here's the detail from my Apple System Profiler:
AirPort:
Type: AirPort
Hardware: AirPort
BSD Device Name: en1
IPv4 Addresses: 192.168.1.102
IPv4:
Addresses: 192.168.1.102
Configuration Method: DHCP
Interface Name: en1
Router: 192.168.1.1
Subnet Masks: 255.255.255.0
IPv6:
Configuration Method: Automatic
AppleTalk:
Configuration Method: Node
Default Zone: *
Interface Name: en1
Network ID: 65366
Node ID: 51
DNS:
Server Addresses: 62.31.176.39, 194.117.134.19, 195.188.53.175
DHCP Server Responses:
Domain Name Servers: 62.31.176.39,194.117.134.19,195.188.53.175
Lease Duration (seconds): 0
DHCP Message Type: 0x05
Routers: 192.168.1.1
Server Identifier: 192.168.1.1
Subnet Mask: 255.255.255.0
Proxies:
Proxy Configuration Method: Manual
ExcludeSimpleHostnames: 0
FTP Passive Mode: Yes
Auto Discovery Enabled: No
Ethernet:
MAC Address: 00:30:65:04:88:67
Media Options:
Media Subtype: autoselect

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    Accessing a Airport Network with a Windows XP PC or laptop (with XP SP1)
    http://www.ifelix.co.uk/tech/1010.html
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