do this:

Select a konsole in the lower left corner. At the prompt type in:

sudo ifconfig

and give use the results.

Also, do you know what kind of network card you are using? Does your cable/DSL modem connect to your computer via a usb connector or a larger version of the phone connector (called RJ-45)? In windows if you go to the device manager you should be able to find out what kind of ethernet controller you have.

Don't give up yet

Edit: Most ISPs don't support linux, that's why there are so many online boards to goto for help.