Sounds like your system does not have an internet connections or is missing dns entries.
Start with an 'ifconfig' and post the results.
Verify that tcpip on the adapter is setup correctly and you have the correct values.
Can you ping your gateway?
Can you ping 'www.google.com' and get a reply. If not, does it at least show an IP address.
Can you ping an internet host 'ping 126.96.36.199'?