Internet connection problem

I am running windows xp professional on a siemens fujitsu amilo L1310G and i am experiencing a problem with internet connection, with both wireles adapter and network adapter i have the same problem. i am able to connect to the router but not the internet, and in the status information for the network connection it says that i am sending information but barely receiving. so i cannot connect to the internet. i have tried running an antivirus (NOD32) but no viruses were detected i tried installing both the wireless adapter and network adapter drivers again and cannot fix the problem, i even tried formatting the computer and i keep getting the same problem, one time i even installed windows xp home edition (which was the operating system originally installed on the laptop) in case the drivers were not compatible with xp pro but i still have the same problem. i am only able to ping the router and get a response, all other addresses i try to ping and get no response. has anyone had this problem or has a clue how to fix it?