Enabling network connections

I've recently install ubuntu as a dual-boot with windows XP Pro on a seperate WD hdd and after some tweaking seem to have the system up and running with the exception of internet access. I have an AMD Sempron 3000+ with 1G of memory, NVIDIA GeForce FX 5200,and an SMC EZ ethernet card (SMC1211TX). I created three partitions "/", "share" and "/home" when I did the initial install. I've been trying various methods over the past three days to connect via ethernet cable to my Linksys BEFW11S4 wireless broadband router (WEP enabled), which is connected to a Toshiba PCX2200 cable modem. I have two networked tivo's plugged into the Linksys in addition to the machine which has XP/Ubuntu installed as well as a wireless Toshiba Satellite laptop. Everything else can access the network with no problems, although I did have one error message on the laptop "IP conflict with another device on the network". I've tried many methods described in various forums but seem to be stuck in a loop wereby I need to access the web in order to make the changes to allow my machine to access the web!!!. I would like to be able to explore this software further but without web access I can't seem to progress so if anyone can offer some advice i'd greatly appreciate it.

network

I assume you have tried system-admin-networking. Is the card listed and can you activate it? As root, in a terminal, type ifconfig; that should show if the card is up and running. Ubuntu doesn't seem to activate ethernet cards when you first install. The other possibility is that Linux does not have a driver for your card; if not  swap the card for a Realtek based one. cheers Fredd

network

Yes I have tried system-admin-networking, ifconfig returned the following eth0        Link encap: Ethernet  HWaddr 00:E0:29:36:A9:EA        inet (address of the computer) Bcast (address) and Mask (address)        UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1        RX packets:0 errors:0 dropped:0 overruns:0 frame:0       TX packets:0 errors:0 dropped:0 overruns:0 carrier:0       collisions:0 txqueuelen:1000       RX bytes:0 (0.0) TX bytes:0 (0.0 b) lo     Link encap: Local Loopback       (the information after this is similar to above) I've left out the actuall addresses. I am not experienced enough to be able to interprut this info, does it mean the card is recognised and running.  Ive noticed that after re-booting if i go Applications-System Tools-Network Tools, the Network device tab defaults to: Loopback Interface(lo) I've tried setting the Interface Properties to Static IP as well as DHCP  with no change. Im writing this on my laptop and just recieved another error message "IP conflict with another device on the network" so I guess something is happening.

network

This means the card is up and running. If you goto connection properties the device, possibly called 'eth0', should be listed in the drop down menu. The problem seems to be with the way in which your network has been configured. You shouldnt use DHCP unless you have a DHCP server configured on one of the machines. The router might be acting as a DHCP server, but in that case setting every machine to obtain an ip address from DHCP should prevent any 'ip conflicts'. The best bet is to set every machine up with a static ip address in a sensible network space and then try various stack tests. If you cant even ping the router interface from the computer then there is probably something wrong with the hardware configuration or the cable or the router.