I have a client's PC that won't connect to the internet. System is XP Pro, 256MB RAM, P4 1.7 GHZ.

I have done ipconfig /release & renew with success. No connection. I have done winsock repair, scanned with spybot, adaware, spysweeper and even replaced the NIC, still no go. Checked for virus, nothing. I still am unable to get this to connect to the internet. My ping to the gateway on the router even times out even though it obtains an ip. I am at a loss. Any help appreciated.