My laptop cannot connect to internet

Hello,
Hello, my laptop Windows XP is showing that its connected to the internet, but when I try to open internet explorer it says'cannot find server. Page can not be displayed. How do I get it to connect?
My desk computer wired to a router thats connected to my desktop and the internet on there works fine. For some reason though just the internet on my laptop does not work although the wireless connecting shown in good status. I recently tried to restore the system and problem is still the same. Since then I am not able to access the Internet. Does anyone know how to fix this? If so please let me know. Thank you.