Random IP Addresses stopping me use the internet

Not sure how best to explain this, as it is an intermittent problem.
I have a macbook pro that uses the internet fine, no problems. I have a small PC laptop that uses the internet fine, no problems. I have a Power PC dual 450Mhz attempting to use the internet, with intermittent problems. I have a 3rd party Realtek wireless card, that I appear to have to keep de-installing and re-installing the OS X Drivers for to get onto the internet. I have broadband through Sky, and an Airport Extreme Base Station. Internet appears to work temporarily through either AEBS or the Sky router (although more problems occur with self assigning the IP address with the Sky router than with the AEBS). When it works I have the following in TCP/IP-
IP Address: 192.168.0.2
Subnet Mask: 255.255.255.0
Router: 192.168.0.1
Occasionally this info remains the same, advises me I am on the internet, but am unable to open any web browsers. If I refresh the DHCP lease, it either comes up with the same info, or a newly assigned IP address of eg. 169.254.162.94 comes up, and I cannot connect to the internet, and each time I refresh the DHCP lease the same IP address comes up.
Does anyone know why this is happening, I seem to be able to go onto the internet for about 5 minutes before something crashes it.
It all works fine on my other computers, I have recently upgraded to 10.4.11 and have 896MB of RAM.
Any help appreciated, Ian

Okay, let's back-track a little and start removing variables.
"You have the AEBS shut down now, right?" Correct (However when this is turned on, my PC and Powerbook both connect to either wireless network without a problem)
"And the Sky router is up and broadcasting wireless, correct?" Correct
"Are you running a secure wireless network with WEP or WPA authentication?" Running WPA
"Is the G4 in close enough proximity to get good signal from the Sky router?"
It is through in a conservatory about 8 metres away, almost in a direct line from the router with a glass opening door in between. It has always previously worked fine when the router was upstairs and the G4 downstairs. I have also brought it in next to the router and tried wireless and it still has not worked. I have plugged the ethernet cable directly in and we do get internet.
Based on what you're describing, it sounds a lot like the G4 is getting spotty wireless connection and dropping the link. Have you tried just opening System Preferences/Network, making the wireless connection and just watching what happens there? (Yes, now, I have 2 setups, "Automatic" and "Desk" one for manual DHCP assignment and one for Auto using DHCP.
I have sat there, and with the manual IP addresses given installed, I get a green light and it states that it is connected to the internet, but when you try and open a browser it doesn't work. My Auto setup now just consistently defaults to a 192.254.xxx.xxx and now vv.v.v.v.v.v. randomly may it actually connect to a 192.168.xxx.xx IP address and get the browser working, then it will default back to a 254 setup.
When using DHCP routers, it's usually not a good idea to manually assign IP addresses on client machines unless that IP address is reserved in the DHCP server and tied to a particular machine record (MAC address). That said, there are some devices that will only work when they're assigned a reserved address in the DHCP server, and your Realtek card might be one of them. If you're comfortable working in the router DHCP configuration settings, you should be able to add the G4 to the address reservation list if the router can see it.
the above to be honest I would have no idea on how to set up so if you could talk me through it that would be great. I also do not know what the renew lease does and whether this is something I should click on each time.The ther part of the problem I have is I am unable to run a diagnostics check or assistant because I do not have airport running and the setup for the step by step guide isn't geared towards having a 3rd party PCI network wireless card?
Help would be greatly appreciated, because I do not know what to do and cannot afford to replace this machine currently.
Thanks Ian

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