Cannot access Internet

A little advise on this would save me tons of time.

I have a small business XP network. 5 computers connected to a switch. All static IP addresses 192.168.1 thru 192.168.1.30

All running WIN XP PRO

With my DSL modem’s address 192.168.1.1.

Here is my problem

One computer lost the abilty to connect to the Web.

It works fine with the LAN but no web.

I can ping all the other computers but not the the DSL modem and not the DNS servers.

I am at my wits end. Settings are identical to all computers. All of them work, but not this one.

This is a DELL dimension 2350. I called DELL. had me three(3)! hours on the phone. Nothing doing.

WIN XP PRO came pre-installed, WO reinstall disk…