xerox

Ok, I have a wireless router. I've had my old laptop and my main computer connected to it and working fine for awhile... I just got a new laptop today, and ditched the old one, the new notebook has a built in wireless nic card. As soon as I turned on my notebook, Windows asked me if I wanted it on a network and I said yes then picked wireless. It was on the internet, but then my main computer wasnt. I kept getting DNS errors when I tried going to websites. So I shut down my notebook and then my main computer was working again. They can ping each other and the router fine. They both have different IP addresses so I know its not that conflicting or anything. Does anyone know whats wrong and how I can get both my computers on the internet without problem? Thanks