Unable to connect using TCPIP

I'm not able to connect to internet or to any internal terminal server, but i can ping internal and external computers, nslookup resolves name correctly (internal an internet).

I have Windows Vista Home Premium

I can't get pop3 email

Any suggestions
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albertofresnilloConnect With a Mentor Author Commented:
Both, by name or IP Address i'm able to ping. DNS is working well.

I have disabled Windows Firewall to be sure it's not the cause of problem.

I have just removed Norton 360 and i installed avg free, im testing with norton removal tool to check if it is the reason of failure.
can you ping external addresses by name or IP address?
For example try to ping yahoo.com
albertofresnilloAuthor Commented:
Norton was the problem. Thanks
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