Cant get 2nd laptop connected to wirless.

Hello,

I have a cable internet modem, i have used the ethernet connection to go into my wireless router. This has provided me wireless internet on my main laptop (vista 32-bit), with no problems, however when i try to access the internet on my 2nd laptop (xp) it says it is connected however it cannot display the web page.

Any ideas how i can have both computers accessing the wireless internet??

Many thanks