win 98 machine can not get to the internet from the lan. running xp professioinals on the rest of the network.

Operating system 98.  Can see the network. However we can not get the internet to come up on our lan.   we had to assign a static ip address to get the network up.  It would not obtain a ip address automatically.  we can see the network but the internet will not come up.   we have checked and made sure it is assigned to go to the lan for the internet address.  dns and wins are disabled.  netbios is check over tcpip.  all firewalls have been disabled.  any other suggestions you can help us out with would be appreciated.  we are running xp professional machines on the rest of the network.  we also are going through a switch.