win98 machine wont see server.

I have a small network based around a SBS2003 server, it includes 4 XP
Pro workstations which are all quite happy, and one win98 which
completely ignores the server.

It can ping the server by both IP and resolving the name, but will not
browse to it. Failing with the network name cannot be found.

This also occurs if I try to access it with the IP address.

I can access the intranet website by using http://10.0.0.9

I have installed the Active Directory patch for Win98, but no help.

I am running quickly out of ideas!!

Thanks in advance for any help

Blair