IE6 Problem

I have 2 computers shareing a DSL connection thru a gateway. One system is running XP and the other is running 98SE. The 98 machine will ping the gateway and the XP machine with no problem. It will ping a web site as well but IE6 will not connect tothe internet.The xp machine connects no problem.
Configuration:
DHCP enabled on gateway.
Both machines are set to recieve ip addresses automatically.
TCPIP installed on both machines.
Why can I not connect? I keep getting DNS error.