1 pc in office has no internet, but can reach network

I have a client running NT 4 server w/10 Win XP Pro SP2 workstations. 1 pc can not connect to the internet. There are no restrictions imposed. He can connect to everything inside the network. NAV is clean, not in profile. Re-formatted & reinstalled XP. NIC card is on MB, disabled & used USB one, no change. Different cables, switches, pc’s – all OK. Can ping out, but no web or email.
Any suggestions would greatly help.