can see network but not internet!!!

Hi I am having trouble with a wireless link on a Win98 computer. I can see my other computers but cannot see the internet. System is:

DSL Modem to SMC 4-port router (DHCP server)
1 port connected to Trendnet wireless access point (disabled DHCP server)
3 ports connected to wired network
USB 802.11b Gigafast wireless adapter
All IP addresses are automatically obtained.
Mixture of WinXp, Win2K and Win98 machines
Running TCPIP, and IPX so that Win98 machines probably network with WinXP machines.

The USB adapter works fine on other computers in the house including a Win2K laptop and another Win98 machine. All computers also work with my wired network.

However, on one particular Win98 laptop ("computer 1") I cannot see the internet when using the USB adapter, but it can see the internal network. It is fine with its wired network card.

I have tried removing and re-installing Winsock and Winsock2.

I'm at a total loss as to how to solve this. Please help!!!

Thanks, ..Roger