Unable to connect AOL9 to router via wireless

Hi

Have a bit of a problem

My forends laptop is connected to her wireless ADSL router ok. We have IP
address assigned by the router and signal strentgh is excellant.

I can open 192.168.1.1 for her laptop to look at settings for the router.

Another PC connects to AOL ok via ethernet.

On the laptop , when we try and sign in , we get the following message DNS
SERVER UNAVAILABLE OR UNREACHABLE.

I have tried uninstalling AOL9 , Have rebooted Modem and laptop in that
order several times , but the problem is still there.

Has nayone any idea where to go next.