Laptop Cannot Connect To Internet

I have a Cable ISP for my home desktop, and everything on there is fine, but my laptop has a wireless internet setup. Everytime i try to add a cable set-up, it says the system should already accept and/or run with a cable connection, and then cancels out of the internet wizard. is there any way to fix this so that I can go online with cable on my laptop? (without my Xp disc being needed, because it's "somewhere", just not sure where.)